Link to request body

I've looked but don't think there is a way to get a value from another request body, like you can with the response body.

For example, I have an API that allows people to add icons to a map.
When the case is closed, they call another API to set the icon status to closed.
And when they want to remove it from the map, they call another API.

![image](

Would be good too link the case id from the AddIcon request body, in the close/ delete API's.