How to constrain gameplay camera pitch

I’m learning how to use the new gameplay camera system.

I have an orbit style camera on a separate asset from the player, with an orbit rig. I can’t figure out how to constrain the cam so the pitch is limited to a small range.

I’ve made a variable on the rig attached to the translation offset

then in the asset I’ve specified that cam as a prefab and again, made another variable for that

but I can’t see how to grab that exposed variable, or even if this is the right way to do this.

Any help would be greatly appreciated.

EDIT - these nodes look promising but it’s not clear how to get this var table ref or even if this is the right way to be going about things