Auto Update lastmode

[nicogulo]

Hi there, I have a sitemap configuration like this

transform: async (config, path) => {
        const currentDate = new Date()
        const updateDate = currentDate.toISOString().split("T")[0]

        const dayOfMonth = currentDate.getDate()
        const shouldUpdate = dayOfMonth === 1 || dayOfMonth === 15

       ....

        return {
            loc: path,
            changefreq: shouldUpdate ? "monthly" : config.changefreq,
            priority: config.priority,
            lastmod: shouldUpdate || config.autoLastmod ? updateDate : undefined,
            alternateRefs: alternateRefs ?? []
        }
    },

Is it possible to configure the changefreq and lastmod for auto-update similar to the ISR system https://nextjs.org/docs/pages/building-your-application/data-fetching/incremental-static-regeneration? I want the lastmod to automatically update like ISR, where it will update automatically when there are changes to the static page. Please forgive my silly question. Thanks