Quick Replies

[ProgramminCat]

When you get a text message, have the ability to reply common replies like "OK", "Yes" or "No" on the watch.

[LinuxinaBit]

This requires companion app support which, as I've mentioned in one of your other suggestions, is really slow.
I would love this feature though :)

[ProgramminCat]

In the Gadgetbridge wiki
Canned Messages
Replies: define answers to pick from „interactive notifications“, so you can e.g. answer SMS directly from your Gadget