Trying to sync data from JEFTIT

I've been using JEFIT for 10 years as my go to gym app. I've had Garmins for the last 8 years and I really haven't trained enough for it to be a problem for me. I'm now training for a long event in New Zealand and would like all my data in one place. Does anyone know how I can get all my gym data onto Garmin. 

I've got the Instinct 2X and as nice as it is, inputting gym data on it is a hassle 

Any help would be appreciated.