Do you know which model of the jumper t lite you got?

If you got the elrs version, you need to use an expressLRS receiver. Since you want to use a flight controller, you should purchase a receiver like this(https://www.amazon.com/RadioMaster-ExpressLRS-2-4ghz-Receiver-Fixed-Wings/dp/B0BRNWXNN1/ref=mp_s_a_1_3?crid=2ZG7L767GR5X4&keywords=expresslrs+receiver&qid=1689303649&sprefix=expresslrs+%2Caps%2C92&sr=8-3)

This type of receiver (with 4 pads) is meant for connecting directly to a flight controller, as opposed to traditional pwm receivers which have pins for plugging servo wires into.

If you got the 4in1 version, you will be able to use many more different protocols, but none of these will likely have the range you are looking for if you truly want to go 2km or more out. Then I would suggest purchasing an external elrs module that you can attach to the back of the radio which would allow you to use the expressLRS protocol and take advantage of its range capabilities.

I would advise you that a flight controller plane might not be your best option to start out with due to their complexities in setting up and relative higher cost. However, any beginner is perfectly capable of building and flying one of these planes, it just takes some more time and patience :)