As far as I understand, the companion app joplin-vieweb (developed by @gri38), if you are willing to host it on your own, can provide you with a web interface. It already supports an impressive set of features (although some Joplin features are still missing), and seems to be maintained (latest version updated last week). I have no experience with using it or installing it, maybe the technical barriers will be too high for some, but perhaps it will do for you. There's a forum thread here.
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