How many calories do you burn when using a wheelchair?

Hi I am just starting my latest weight loss journey after a new medication helpped me gain back the 20kg I lost last time. This time it's a bit different with my medical condition I am having to use a wheelchair alot more so instead of jogging I will be swimming, kayaking and using my manual wheelchair as well as a low calorie diet. But to best track and plan my weight loss I feel a need to understand the calories that are burned in using a wheelchair but in exercise function on my fitness pal it has nothing about calories burned while using a manual wheelchair. Does anyone know anything about losing weight while using a manual wheelchair? It would be a great help to have information about calories burned and such as my doctor hasn't been much help.
Thanks for any information