My Resolve license came with my camera BMPCC 4k bought almost 4 years back. If you want the best deal it would probably be to buy a Black Magic speed editor which costs like 36k and comes with resolve studio. I have a Atem Mini Pro as well which didn’t come with any license.
However buying the Studio version for subtitle creation is really not worth it.
Its says its works for free version why not try it. It will probably take a few mins to setup and try. If it doesn’t work then time to try for different options.