Some out of roundness in the brake drum is normal. It’s too much though if the wheel gets pretty much stuck in one position, but is totally free the rest of the way around. On my Corolla I don’t notice any particular point where the drum sticks at all. But I do notice some normal sticking on my Ford truck. What’s normal is a little bit of drag in one position, and totally free the rest of the way 'round.
Is your actual problem you are posting about the uneven friction, or is the problem the squeaks? The squeaks can usually be addressed by using Toyota oem shoes, properly installed and lubricated on a clean backing plate. If the oem drum was still thick enough to not require replacement, it should be gone over with 120 grit al-O2 sand paper to make a cross hatch pattern on the inside drum surface, then cleaned of any grit. If the drum was on the thin side, even though technically passed the spec, replace it. If you did replace the drum, squeaking can be caused if the drum wasn’t properly cleaned before installation. New drums come with an anti-rust coating that must be removed prior to use.
Use a high temperature brake grease product for that. May be copper based. But it has to be a high temperature grease. Often it comes in the package with the new shoes.