Hi there! I have figured out that the latest version which works exactly this way is GB Studio version 2.0.0 beta 4. It would be nice if it was still available on Itch.io or GitHub. It also works similarly with 2.0.0 beta 5, but instead of "_script_variables" you should look for "_script_v" in the `game.map` file. For later versions it is more complicated...