Photoshop supports/saves jp2000 s; Lightroom should as well. Simple as that.
I don't need any editing functions, just to import and share them in a catalog.
Dang, i/Photo handles them, which we used as a pitiful substitute until the app no longer supported pdf.
jp2 is standard in most digital archives/libraries, so Lightroom support or a shareware plug-in would be much appreciated. BTW: if you've never come across the format you're missing out on millions of high-res, copyright-free materials. Check out archive.org and you'll be advocating big time.
First, we're not Adobe, we can't add features to the software. You have to submit a feature request to Adobe.
The philosophy I have heard people from Adobe talk about (in Adobe videos) is that Lightroom Classic is for photos that come out of a camera (and common derivative files like TIF), and I don't think jpeg2000 files come out of any camera on the market today. So if that's correct, there's really no chance of them adding jpeg2000 support.
Photoshop has always supported non-camera formats. Which is entirely a different philosophy.