Real-Time Template Application in Jira Forge UI Modifications

I’m developing a Forge app for a template system. I use the UI for filling in fields when creating a ticket and a custom field module for the appearance of a select field on the ‘create issue’ screen. My goal is to use the UI Modifications API to detect when a user selects a template and then automatically fill in other fields (Summary, Description, etc.). The problem is that when I choose a template from the select field, I have to exit and re-enter the dialog for it to be applied because the onChange event in UI Modifications does not seem to support Forge Custom Fields yet (as per RFC 125). Is there a solution for this approach?