Every minigame also has an object UUID, and an object folder to go with it. So you should be finding more related to minigames really.
For example, if you take the Audi V Run demo pkg, It only has one SCENE file so its a good example.
You will see lines like this.
Game Rules "minigame"
View attachment 38621
Audi Score Board "minigame"
View attachment 38622
Then 4 of these for each of the 4 points you can start the actual V Run minigame. They all link to the same UUID, just have different locations within in the scene.
View attachment 38626
Then if you look into the USRDIR/OBJECTS folder for that pkg, you will see these.
View attachment 38625
Most objects in a scene that are interactive in any way (Except screens and seats and scene links) will have a UUID folder in OBJECTS. So this includes locations where minigames can be started, notice boards with RSS info. Shops, Score boards, Interactive Game Rules etc. Basically if you want a pop up to appear for something, you can create a custom UUID, add it to the scene file like the examples above (but complete). So for example you could take a minigame pop up from one scene, add it to another scene.
So just like we can add custom spawn points and scene links, we can add links to other objects just with notepad. The UUIDs just have to be unique, so you could take an object like a piece of clothing, copy it into a new unique UUID folder, then mod the files inside how you want it. Now when the game starts up you will see your custom object along side the original.