How to add merchant onboarding instructions in Theme App Extensions?

[adisan_amz]

I am working on a theme-app-extension. I plan to deploy it as a custom distribution instead of a public.

I wish to create a post installation merchant onboarding instructions however I am unable to figure out how I can do so. The documentation here does not elaborate anything on this.

The goal is to give the merchant the custom app link and upon installation, they should be shown with the next steps on how and where to place the app blocks.

My theme app extension contains both App Blocks as well as App Embed Blocks. Due to this, I want the onboarding page to have both the App Block instructions along with the deep link for the App Embed Block.

Which file do I have to modify for this? Any pointers would be appreciated!