Mandatory options if some other options are specified

Hello. I went through all the examples, documentation and, in part, the source code, the list of problems, but nowhere did I find any mention of the following.

For example, I have the following:
`app.exe --p1 test --p2 test --p21 false --p22 path`

What is the right way to make certain options mandatory while other options are present? For example, --p21 and --p22 are required if --p2 is given. --p2 can be optional.

If such an opportunity is not provided in the project, then perhaps it is worth discussing this idea?

Thank you.