Why do you want this?
Is interfernce severely limiting you range or do you want to fly long distance?
I have seen 2km with mine over open sea yet elsewhere I have lost signal at 400m.
Bear in mind that if keeping the drone in sight is a legal requirement where you are then the range limit of your eyesight is probably around 600m.
I have seen a CE spec Mavic Mini reach 2.4km using the unaltered controller and the pilot decided to turn back, not the drone.
Bear in mind any wind and that reaching, or returning from, such distances could leave you short of battery.
I have seen 2km with mine over open sea yet elsewhere I have lost signal at 400m.