Your answer in how to add it to the XDF will be buried in a good book called "The IDA Pro Book - The Unofficial Guide to the World's Most Popular Disassembler" by Chris Eagle. I'm sure there's a similar book out there for the NSA disassembler program called "Ghidra".

But neither of these disassembler methods are for mere hack PCM programmers such as myself. You gotta' be seriously into code write programming and I'm not.

Rick