Can I replace this light switch with a switch/outlet combination?
The two wires from the old switch go on the two top screws, hot on left and switched hot  on right.

Add pigtails to the black and white and ground bundles with the wire nuts.

Black goes on hot side (left bottom screw).

White goes on right bottom screw.

Bare copper goes to green screw.

If there is metal link between the two screws on the hot side, then you could leave off the pigtail on the top screw.