Hang blinds inside window frame on drywall only?
No, you cannot support your blinds with two pieces of paper, because that's all there is in drywall to resist the tension force pulling out or at an angle. The contained gypsum is strong to compression, you can stand on it if it's flat on the floor. But if you screw in and then exert force to pull the screw out, with very little force you'll either have the screw fall out, the drywall blow out, or the drywall screws attaching the drywall to the building structure will pop out the back side and the section of drywall will collapse. You need to install the blinds and other heavy objects to the building structure like studs or into concrete you have behind your walls.