Conditional validation in request body

Hi,

 

I have a post method which takes request body ((Dynamic) List of maps). I am trying to work on validations within the request body like 

if key1's value > 1 then key2, key3 are mandatory

or 

if key4 is provided, key5 cannot be empty

 

The list of maps is dynamic and not predefined. Is there something in openapi which helps in solving above scenario.

Any help is really appreciated.

Thanks,

Aruna