Import Pictures to Entity Image filed CRM

Hi,

I want to import a couple of hundred pictures to different records in the Product entity in CRM. I figured there must be a way to do that using my image path and the Product ID in CRM, and then connect it to the field Entity Image on the Product entity. This field is not visible when I am trying to import data. Neither is it visible on the form, how come since I would assume it is by default on the form since I can add the pictures manually. 

Any ideas? 

Thanks!

/Isabell