Using Mixins within MCCreator

Heyo! I've recently got into java modding and have learned all the basics using an actual IDE in intelij. I know how to use a mixin within that, but im not quite certain how to do them on MCcreator.The reason I'm doing this in the first place because I've realized that i was spending too much time doing really tedious copy and pasting of classes, and was hoping to cut down through using this. I'm trying to do it on 1.19.2, and the plugin I saw for it doesn't support that vversion. Any help would be greatly appreciated!