Use of Virtual Data in BPC Embedded

Hi Folks,

This question relates to BPC 10.1 embedded (actually, BPC Optimized for S/4 HANA).

Is it necessary to physically store data in BW to use it in Planning Functions (e.g. FOX)?

For example, if I have some headcount data sitting off in an HR system, and I want to multiply this by some plan rates I entered in BPC, saving the results in BPC.

In my example, I do not want to bring the Headcount data into BPC via ETL.

Is this type of approach supported? Recommended?
If so, how is it technically accomplished?

Kind Regards,

-Elliott