How would I make a room auto generation system similar to the backrooms?

Or even have rooms auto generate based on multiple templates.. Similar to a roguelike.

Have you checked this thread: construct.net/en/forum/construct-3/how-do-i-8/generate-random-dungeon-layout-169479

And this one? construct.net/en/forum/construct-3/your-construct-creations-9/procedural-dungeon-generation-169944

They came with examples & references.

Took a look at both, I dont think these algorithms/methods will work with how my game is set up visually. I apologize for not originally providing a visual. The walls are all tilemaps, and I'd like each room to have its own individual designs & random item spawns etc. Would there be a way to do this/is there any examples or tutorials on how to do this?

Spelunky like random generator article & demo: tinysubversions.com/spelunkyGen