dbFS to dbm conversion?

Dear All,
I use the AGC function for demodulation and display the FFT of the received signal. However I am getting the dbFS value, not the dbm value. I can also read the RSSI value.
How can I convert the dbFS value to dbm? Do I need manual Calibration?
Thanks in Advance.

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Any updates on this?

Tagging @Karolis in case he can advise.