While we wait, try this powershell script, appears to work well for the purpose of adding the available uninstall flag to new apps:
https://andrewstaylor.com/2023/08/01/setting-apps-to-self-service-uninstall-in-company-portal-using-powershell/
https://andrewstaylor.com/2023/08/01/setting-apps-to-self-service-uninstall-in-company-portal-using-powershell/