App Install Banner Doesn't Display

To clarify, I’m hoping to prompt them to install it as a PWA.

It seems the admin setting for this:

Actually gets them to install from the app store, which is not what I want.

In addition it looks like this setting only offers for trust level 1… Which doesn’t appear to be configurable?

Anyway, is there a way I can get a similar banner to prompt for PWA install? Or would I need to create a Theme Component for that?