As for adding it as a profile:
They seem to either use a jenkins download page https://jenkins.modmuss50.me/job/FabricMC/job/fabric-installer/job/master/) or a buttonbased page (https://fabricmc.net/use/).
@Hexparrot can answer best for feasibility of making a profile, but as it’s not a list of releases it can easily harvest, I guess it is not currently easily done