There's the deluxe edition you can get in the $10 tier on Patreon, or you can use a cheat plugin, of which there are apparently a few. I use
this one, though it needs a few extra steps for RPGM MZ.
1 Go to the game's folder, where game.exe is
2 Create a folder titled "www"
3 Move the game's "js" folder into the "www" folder
4. Extract the contents of the "Cheat-Menu" folder from the .zip into the game's main folder
5. Run MVPluginPatcher.exe. It should only bring up a command prompt window for an instant and then close with no confirmation.
6. Move the "js" folder back to the main folder
7. Start the game and press "1" to access the cheat menu