Just buy the Apple Leather Folio case. The problem is solved then.
I wear the iPhone 11 Pro Max for almost 2 months in my pockets (also jeans) and the screen is still flawless with this case.
Most scratches tend be abrasions from the likes of sand and other small particles that get mixed up with pocket lint or whatever is in the bottom of a purse. A folio won’t do much in regards to that.
Best solution is simply a screen protector.