Backpack and pivot table

Hi, I'm using backpack for a small project but I'm stuck. I have these tables:

• colors:
  • id
  • name
• products
  • id
  • name
• color_product
  • color_id
  • product_id
  • category

Each product can have three categories of color and I want to store them in the pivot table when the user creates a new product with a form like this:

• Product name (text field)
• Color 01 (select2_multiple field)
• Color 02 (select2_multiple field)
• Color 03 (select2_multiple field) Do you if is it possible and eventually ho to make it?

Thanks