In more detail, I use a combination of dbPoweramp and MusicBee.
dbPoweramp can convert just a few files, or vast numbers in a batch
This brings us to the key problem. WAV files don’t have tags like Artist, title, album etc. (there are some fudges, but in general they don’t).
If your WAV files are systematically named then dbPoweramp will at least have a go at inferring tags from the file names.
I then import into MusicBee. In general a music management program won’t have a clue what your new FLAC file is if it doesn’t have tags.
MusicBee has the notion of an “Inbox” - a holding pen for files before they’re added to the library. So you can go in and sort out tags before adding / moving the files to the library proper.
This is quite a deep rabbit hole. It kind of depends on how serious you are about digital.
MusicBee is free (no idea why).