In terms of dramas you may find In the Name of the People interesting.

For documentaries, I’ve recently seen mentions of How Yukong Moved the Mountains, although I haven’t yet found a place to watch it.

There’s also a large collection of leftist movies which includes fictional dramas and documentaries about USSR and PRC over on hexbear. https://hexbear.net/post/9615

Edit: CGTN also has some good documentaries on modern and historical events.