If you have access on your CAP website to the file with your fields that you declare every year you can download them and then upload them on Spotifarm. If you use any other software or webservice on which you have draw your fields. You may be able to download a file in the .shp format and then upload it as well.
If you ever need help you can send us an email at this adress firstname.lastname@example.org
Enjoy Spotifarm ! 🙂👍🏼