I just want to second that I think this is a really good suggestion. I read @Sean 's reply, and I understand the intention to make a tailor made Bunpro parser. For sure that makes sense and is admirable, but is also likely a heavy feature to rollout. That’s why, in the meantime, I’d argue it’s an easy win to rollout out a standard open source parser, like what Yomitan uses, until the “golden” Bunpro parser is ready. The nuts and bolts of such a feature would stay the same (e.g. long press word in sentence to pop-up / add to reviews). All you’d eventually have to do is swap out the parser on the backend (or allow it to be user configured).
To be honest, all I really want is a standard parser, since 99% of the time what I’m wanting to add is just vocab, not grammar.