u/Dalimey (who appropriately identifies as "LAWFUL STUPID" shared a warning from reddit admins issuing their final warning against making the sub NSFW (despite the fact that the users of the sub are in full support). They promised to reply to it with "roll for persuasion or intimidation" if they got 10k upvotes, and here is the result. Outstanding move.
You could open an issue on Lemmy's GitHub for this feature. It sounds really interesting. The developers should be aware of such features and how many people are interested on them.