I couldn’t find any information on that question.
We are working on it: https://github.com/JabRef/jabref/pull/3421
That looks quite active, which is good. On the other hand, how difficult would it be to package an old Java version and an old JFX together with Jabref in order to make it independent of the system packages?
we also have a snap package of the current dev version:
This comes with an appropriate jdk version or requires ones. I’m not that deep into that package stuff.