How to Generating documentation for a custom app

I have the same requirement to generate the docs for custom app.

but it seems make-docs and build-docs are all not work now.
So, how to generate the docs for custom app ?

frappe@e8811978c502:~/frappe-bench$ bench --version
5.16.2
frappe@e8811978c502:~/frappe-bench$ bench make-docs erpnextcn current                       
Usage: bench [OPTIONS] COMMAND [ARGS]...
Try 'bench --help' for help.

Error: No such command 'make-docs'.
frappe@e8811978c502:~/frappe-bench$ bench build-docs
Usage: bench [OPTIONS] COMMAND [ARGS]...
Try 'bench --help' for help.

Error: No such command 'build-docs'.
frappe@e8811978c502:~/frappe-bench$ bench build-docs --help
Usage: bench [OPTIONS] COMMAND [ARGS]...
Try 'bench --help' for help.

Error: No such command 'build-docs'.
frappe@e8811978c502:~/frappe-bench$ bench write-docs --help
Usage: bench [OPTIONS] COMMAND [ARGS]...
Try 'bench --help' for help.

That feature has been removed (refactor: remove autodocs, no longer used by rmehta · Pull Request #7453 · frappe/frappe · GitHub) due to it no longer being used by Frappe.

Not aware of any alternatives.

EDIT: More info at Frappe Documentation Generator

thanks for your reply. It’s a pity that this function is no longer available. My usage scenario is that this is a custom APP, so two main information need to be conveyed to users through documents: what functions are there and how to install them.