I´ve looked into converting rates from the DJI fpv drone to Betaflight rates/Liftoff rates, and actually asked Joshua Bardwell.

Betaflight developers have confirmed that the DJI FPV rates, are the Betaflight "Actual rates" introduced in BF 4.2.
Liftoff does not use Actual Rates, so what we have to do, is convert the rates from Actual Rates, to normal BF rates, so we can put them into Liftoff..

I´ve converted the rates that comes with the DJI FPV drone.
It won´t ever be 100% exact, but it´s pretty close. Here´s a screenshot of the two rate lines.
The red curve is the Actual rates (dji rates), and the purple line is the betaflight/liftoff rates..

SCREENSHOT OF RATES CONVERTER [i.imgur.com]


So what i´ve found to be good rates to match the dji fpv drone, is:
RC Rate: 1.01
Super Rate: 0.52
RC Expo: 0.21

I have updated this DJI FPV drone that almost 5000 of you are flying, with the new more accurate rates.

Here´s a link to the actual rates converter. Please play around with it, and get back to me, if you find rates that match the DJI fpv drone better than mine, and i´ll take a look.
What you do, is put in the dji rates in the "Actual Rates" and move the Betaflight sliders to get it to match.

LINK TO ACTUAL RATES CONVERTER ! [desmos.com]

Happy flying <3