The Shimano page recommends one or two bottom brackets. Eg: FC R3030 recommends BB-RS500-PB for press fit or BB-RS500 for threaded.
How useful is this field? If you are looking at a given bike, you know the shell width, and so that is the thing you match up. Eg: search for 68-70 BCD. (where ShellTy like "BCD")