Actually I ran a current development build of the app which seems to have the feature already. There is a small chain icon next to the vote arrows which jumps to the comment and it's parent and allows to load even more context. So maybe it will ship in the next app update when release :)

Yes, I made two small contributions till now. The maintainers seem pretty responsive when new PRs are opened and open to the stuff people are adding. Did not have a thorough look through all the code of the app yet but what I have seen seems structured quite good and I look forward to working more with Kotlin and Jetpack Compose. Am a Java Dev for work, quite some time since I last worked on an Android App but making small contributions first should get you started

I've been doing it in the Jerboa app.

Edit: I lied, it's not directly from my inbox. NVM. I go to the commenter's comments and go to the context from there. The comment is usually first or second on their list, so it's not hard to find. But yeah, extra steps. I wish I could reply from the inbox in general.