Does xpath or json path get evaluated in pipeline parameters?

I am trying to see if I can retrieve the payload when a pipeline is exposed as a task?

Example:
Payload : 10

Pipeline parameter:
p = /a/b OR $.a.b

I want ‘p’ to take the value as 10 (in this case) and show up under pipeline parameter when ‘capture’ is enabled.

Is this supported? If yes, how?