There is no option for entering Planner group in IH01. So, its not possible to get the details from IH01.
And, you don't have any other reports which shows the equipments belongs to functional location with planner group.
In general, Planner who is planning for functional location will be same for the equipments as well which have been installed to that functional location.
You can run IH04 report to get the functional location separately & get the equipment numbers by giving those functional locations by giving the input to IH08.