SOLVED Any easy way to adjust variables in-game?

let's say I want to tweak the values of my platformer game (gravity strength, jump velocity, max running speed) until I get something to my liking. Is there any easy way to do this in-game? Unity already has this built in. I am not aware GMS has such feature. I don't mind writing a few codes or if somebody has made a custom library for such feature.
 
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