How to make my own .rdb files?

I’ve noticed that a few of my games don’t have very much information at all in the .rdb files, and I’d like to fix that. I keep on seeing that I need to edit some .dat file somewhere and compile it myself, but I have absolutely no idea where to start. I’ve never used github before, so if someone could give me detailed instructions on what to do, that’d be awesome.

The dats are all in this repo, either in ‘dat’ or ‘metadat’:

I don’t actually know how to compile them into the rdb binaries…

After poking around the internet a bit more, I’m still no closer to figuring this out. Has anyone done this and can explain it?