You'll have to nudge the F-Droid maintainers for that. They grab the source code and compile it themselves. The app developer isn't really involved, they just provide the source code and ideally ensure that it can be easily built by others.
Though you may want to give them a week or two before you go nudge them. They might build it on their own when they find time for it.
Though you may want to give them a week or two before you go nudge them. They might build it on their own when they find time for it.