This is a very strange comment IMO. There are already perhaps too many XML and JSON handling libraries for Object Pascal, as well as libraries for pretty much anything else I can think of.
But do they work and are maintained? I do not trust them. At first I used the fpc xml parser, but it stores everything as utf-16 internally, and once it crashed on me during the utf-8 <-> utf-16 conversion. I do not want to use utf-16 for anything, so that was a completely pointless crash.