Unless mistaken, this was already mentioned here
See @girish response:
we have introduced a new environment variable (just last week) in next release - https://git.cloudron.io/cloudron/box/-/commit/daa8a60da282fc3c8bbccd4b2b1a4920c2b06812 . After the release, we have to adjust the apps to use the text in the environment variable. And then, Branding view will set that variable.
So it seems, it is coming.