Either you can specify Inserts (any) as the Function to appear on Attention for a given dedicated Expand Knob zone (which will show Insert chain view allowing you to push an encoder to access params (custom hopefully) for your processor of choice) or you can explicitly set to Insert X as described in one of the TOD's showing a workflow I appropriated from a friend:
https://duc.avid.com/showpost.php?p=...&postcount=188
best,
Jeff