So the idea of Attribution IQ is market leading, ingenious, great, fantastic, we love it BUT it's really annoying not being able to use calculated metrics directly in Workspace. I know you can create a new calculated metric with a model applied but you can't use a calculated metric in the Attribution IQ panel or apply a model on the fly to a calculated metric in your workspace.
JenteDR - not sure if this helps with the question you'd asked in the forum.