Is there a way to show the free percentage of an IAM (Innovation Access Method) VSAM file via File Master ISPF panels or via batch job?
No, there is no way to display the free percentages for an IAM file via File Master.
An idea can be opened if there is no such idea yet, or you can vote for an existing idea, here:
https://community.broadcom.com/ideation/allideas (select "File Master" in the "Category" box).