There is no GUI yet but you can edit the text files to add them manually than have a line that says
*citra_enabled to activate the cheat. If you have multiple cheats you need to add this line for each of them.
60 FS for Pokemon Omega Ruby v1.0
[60FPS] *citra_enabled 08C650C0 00000002
You could if you have a PC, add & activate them on the computer then copy the text file from the cheats folder into Android.