It’s true that the app only imports individual LUTs, but it does support folders. This is the simplest way to deal with folders:
1. In RAW Power, go to the LUTs adjustment and pick My LUTs…
2. Quit the app.
3. Organize the LUTs into folders, add new folders with LUTs etc.
4. Relaunch the app.
5. Go back into the LUTs adjustment and the folders will be shown.
No news on keywords. Sorry.