I wanted to do the same thing and this is how I did it.
Use this rates converter calculator :
Desmos | Calculatrice graphique
How it works :
- Enter in the graph your "Betaflight" rates to visualize your curves
- Play with the "Actual" rates values to approximate and overlay with the Betaflight curves (there can be very slight differences because it's not possible to have the very same curves)
- Get the final Actual rates values and use them in your DJI FPV controller settings.
- Repeat the process for pitch, yaw, roll
Note that in liftoff (latest versions) (or in some others simulators) you can switch the rates type to "Actual" instead of "Betaflight", to directly use the same settings type. DJI FPV use the Actual rates model.
for example According your screenshot I found this rates for the roll :
- center sensitivity : 140
- max rates : 770
- expo : 0.73
I would be curious if you make this test to have your opinion to know if with these settings the behavior of the real drone in flight match to your feelings in the simulator.