IntentChooserCustomAction.kt

val customActionOne = ChooserAction.Builder(
        Icon.createWithResource(applicationContext, R.drawable.outline_android),
        getString(R.string.app_name),
        PendingIntent.getActivity(
            applicationContext,
            /* Request code for the pending intent */ REQUEST_CODE,
            /* Intent for the custom action */ intent,
            PendingIntent.FLAG_IMMUTABLE
        )
    ).build()
val customActionTwo = ChooserAction.Builder(
        Icon.createWithResource(applicationContext, R.drawable.baseline_android),
        getString(R.string.app_name),
        PendingIntent.getActivity(
            applicationContext,
            /* Request code for the pending intent */ REQUEST_CODE,
            /* Intent for the custom action */ intent,
            PendingIntent.FLAG_IMMUTABLE
        )
    ).build()
val chooserIntent = Intent.createChooser(
    // your share intent goes here
).apply {
    putExtra(Intent.EXTRA_CHOOSER_CUSTOM_ACTIONS, arrayOf(customActionOne, customActionTwo))
}

startActivity(chooserIntent)