Yeah, they could do this kind of chapters having another format for the title
You don't have to read this. I wrote it to practice explaining things in writing.
Your comment could do with some editing. It's like a mix of two different sentences.
"This kind of chapter could do with another format for its title."
-OR-
"They could do this kind of chapter with another format for the title."
"Could do with" is a substitute for "would benefit from getting"
I could do with a flashlight. She could do with a haircut. The sink could do with a deep clean.
If you want to sound like a native English speaker, don't say "x could do with having a thing". It's just "x could do with a thing".
In "this kind of x", x should be singular, even though you're referring to multiple things. The resulting noun phrase is also singular.
This comment is annoying. This kind of comment is annoying. D's comments are all annoying.