Badly, you could stretch a book into 1k chapters, but it would be terrible.
What does happen is that the story itself can have 1k chapters, but it's made of various books focusing on different things and you don't even notice because of it's serialized nature.
I think that the most obvious ways is to make it a constant growth story, where one will grow stronger and face new threats constantly, like those Xianxia novels or system novels with levels.
Another way is to focus on a villain or mystery over and over again, every villain or mystery can be different, with vastly different powers, goals and reasons for acting making the story feel new, and the MC grows stronger between villains. Allowing every new villain to be more powerful, and dangerous.
The important thing to make a good story as long as this is to have one single plot, and then pepper it with many others inside it, each one good enough to be called a main plot.
In a Xianxia the bigger plot is the story of a cultivator's road to immortality, but it's filled with villains of the week, character growth, exploration and everything else (there are good Xianxia out there, not everything is a repetitive succession of young masters)
In short, you can have a 1k chapter story, but a 1k chapter book is a terrible idea.
Also, you could do something like western comic books, where the story of Superman can be stretched tremendously and endlessly, but it will still be separated into books