Is there a way to restrict Learning assignment search and management using a constant flexfield?

Summary:

Is there a way to restrict Learning assignment search and management using a constant flexfield attached to offerings, courses and specializations? I tried to do a POC for the restriction for the Learning Assignments but somehow I was unsuccessful. I did try updating conditions to the below policies where it is being restricted by the flexfield but still it was not restricting the results. It seems so far we can only restrict by learners but if the learners have offerings/courses/specializations which have different Learning Specialist Security Group everything will still be returned from the results eg.(role if Learning Specialist UHN