diff --git a/packages/devtools-kit/src/core/component/state/__tests__/format.spec.ts b/packages/devtools-kit/src/core/component/state/__tests__/format.spec.ts
new file mode 100644
index 00000000..132c880c
--- /dev/null
+++ b/packages/devtools-kit/src/core/component/state/__tests__/format.spec.ts
@@ -0,0 +1,71 @@
+import * as format from '../format'
+import { INFINITY, NAN, NEGATIVE_INFINITY, UNDEFINED } from '../constants'
+
+describe('format: displayText and rawValue can be calculated by formatInspectorStateValue, getRawValue', () => {
+  describe('type: literals', () => {
+    // eslint-disable-next-line test/consistent-test-it
+    test.each([
+      { literal: 'test-string', displayText: 'test-string' },
+      { literal: 123, displayText: 123 },
+      { literal: true, displayText: true },
+      { literal: null, displayText: 'null' },
+      // Tokenlized values
+      { literal: INFINITY, displayText: 'Infinity' },
+      { literal: NAN, displayText: 'NaN' },
+      { literal: NEGATIVE_INFINITY, displayText: '-Infinity' },
+      { literal: UNDEFINED, displayText: 'undefined' },
+    ])('type: %s', (value) => {
+      const displayText = format.formatInspectorStateValue(value.literal)
+      const rawValue = format.getRawValue(value.literal).value
+
+      expect(displayText).toBe(value.displayText)
+      expect(rawValue).toBe(value.literal)
+    })
+  })
+
+  it('type: plain object', () => {
+    const value = { foo: 'bar' }
+    const displayText = format.formatInspectorStateValue(value)
+    const rawValue = format.getRawValue(value).value
+
+    expect(displayText).toBe('Object')
+    expect(rawValue).toEqual(value)
+  })
+
+  it('type: array', () => {
+    const value = ['foo', { bar: 'baz' }]
+    const displayText = format.formatInspectorStateValue(value)
+    const rawValue = format.getRawValue(value).value
+
+    expect(displayText).toBe('Array[2]')
+    expect(rawValue).toEqual(value)
+  })
+
+  describe('type: custom', () => {
+    it('type: common custom', () => {
+      const value = { _custom: { displayText: 'custom-display', value: Symbol(123) } }
+      const displayText = format.formatInspectorStateValue(value)
+      const rawValue = format.getRawValue(value).value
+
+      expect(displayText).toBe(value._custom.displayText)
+      expect(rawValue).toEqual(value._custom.value)
+    })
+
+    it('type: nested custom', () => {
+      const value = {
+        _custom: {
+          displayText: 'custom-display',
+          value: {
+            _custom: { displayText: 'nested-custom-display', value: Symbol(123) },
+          },
+        },
+      }
+
+      const displayText = format.formatInspectorStateValue(value)
+      const rawValue = format.getRawValue(value).value
+
+      expect(displayText).toBe(value._custom.value._custom.displayText)
+      expect(rawValue).toEqual(value._custom.value._custom.value)
+    })
+  })
+})
diff --git a/packages/devtools-kit/src/core/component/state/format.ts b/packages/devtools-kit/src/core/component/state/format.ts
index 2070a710..64decff4 100644
--- a/packages/devtools-kit/src/core/component/state/format.ts
+++ b/packages/devtools-kit/src/core/component/state/format.ts
@@ -56,7 +56,9 @@ export function formatInspectorStateValue(value, quotes = false) {
     return result
   }
   else if (type === 'custom') {
-    return value._custom.displayText ?? value._custom.display
+    // For digging out nested custom name.
+    const nestedName = value._custom.value?._custom && formatInspectorStateValue(value._custom.value)
+    return nestedName || value._custom.displayText || value._custom.display
   }
   else if (type === 'array') {
     return `Array[${value.length}]`
@@ -89,8 +91,11 @@ export function getRawValue(value: InspectorState['value']) {
   let inherit = {}
   if (isCustom) {
     const data = value as InspectorCustomState
-    inherit = data._custom?.fields || {}
-    value = data._custom?.value as string
+    const nestedCustom = typeof data._custom?.value === 'object' && '_custom' in data._custom.value
+      ? getRawValue(data._custom?.value)
+      : { inherit: undefined, value: undefined }
+    inherit = nestedCustom.inherit || data._custom?.fields || {}
+    value = nestedCustom.value || data._custom?.value as string
   }
   // @ts-expect-error @TODO: type
   if (value && value._isArray)
diff --git a/packages/devtools-kit/src/core/component/types/state.ts b/packages/devtools-kit/src/core/component/types/state.ts
index 87c3ea4b..c261f990 100644
--- a/packages/devtools-kit/src/core/component/types/state.ts
+++ b/packages/devtools-kit/src/core/component/types/state.ts
@@ -5,7 +5,7 @@ export interface InspectorCustomState {
     type?: string
     displayText?: string
     tooltipText?: string
-    value?: string
+    value?: string | InspectorCustomState
     stateTypeName?: string
     fields?: {
       abstract?: boolean
@@ -15,7 +15,7 @@ export interface InspectorCustomState {
 
 export interface InspectorState {
   key: string
-  value: string | number | Record<string, unknown> | InspectorCustomState | Array<unknown>
+  value: string | number | boolean | null | Record<string, unknown> | InspectorCustomState | Array<unknown>
   type: string
   stateType?: string
   stateTypeName?: string