I am trying to edit a custom column name I created for a file in Sharepoint..I am using the above function but I do not know how to properly set up the "Body" field in the action, I assume this is what's used to update the column names for the file of which I have added a "User" field. I have added screenshots.
I copied the below value from somewhere in this community which I thought would help and I am struggling to find any kind of documentation on this "body" field.
Power Automate Action - Update File Properties:

Sharepoint:

Any suggestions?
Thanks