The SGF standard has a ton of properties
The current SGF standard version, 4, supports lines and arrows (properties LN and AR respectively).
If the OGS front-end could support those, it would be more competitive with tools like sabaki as a review tool.
For context and to explain my need - I work on the Shusaku Study Project. The goal is to provide public-domain commentary of all the Shusaku games that we have, and that also means a lot of effort goes into encoding as much information as effectively as we can into the markup – and that means that, the more markup tools we have, the more options we have for providing information into the markup.
I’m currently using OGS as a basis for the reviews - it’s convenient because we see all the forked reviews so it limits extra management (as opposed to people downloading a SGF and then reuploading it into discord later) so it would be nice if OGS also supported all the markup options!