Overriding check_interval instantiating service template

I am pretty used to using icinga2 with the ascii files but today i tried to add “passive checks” with different check_intervals. So i created a service template for a passive check with the dummy check etc etc.

Trying to add that to hosts does not let me change the check_interval individually for different stale state times.

I have dummy_state and dummy_text as the variables/fields for the dummy check. I am a bit puzzled. It seems i am only able to set the execution variables in the service template and may not later override them.

Did i miss something?