[galaxy-dev] reference in builds.txt

Dear all, I am working on integrating some bioinformatics tools into galaxy for a research team in France. I have a question with regard to the "/tool-data/shared/ucsc/builds.txt" file. I would like to add a new reference genome that is not coming from UCSC. Could you please tell me if this is feasible and, in that case, how to process? Thank you very much in advance. Best regards, Sabrina