LNA chip and Gain calculation

I heard that RFX series have LNA chips on it.

It means RX is amplified after LNA chip.
Then, do I have to consider it in order to calculate gain?

Which I mean, do I have to divide RX with some values (as same as LNA
gain) ?
And after that, can I get a TRUE gain value?

Or can I just calculate RX divided by TX

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