At least I was not able to find a way to do that. That was the main reason I switched back to Firefox on mobile despite actually liking Samsung Internet more.
It's indeed relatively small, but what it may lack in numbers, it makes up for in quality. It's one of the most dedicated, helpful, and friendly communities I've come across.
I've personally been surprised by a pro of having a more intimate community: in my experience, this leads to a higher signal-to-noise ratio in discussions and resources. It feels like what I need to get online is more "condensed".
I think they mean a desktop GUI application on top of git like GitKraken or SourceTree. These sometimes allow you to perform actions like creating a PR (which is not done via git itself, of course).
At least I was not able to find a way to do that. That was the main reason I switched back to Firefox on mobile despite actually liking Samsung Internet more.