Is it possible multiple select on form with checkboxes?

I am trying to implement multiple select checkboxes in form.
For example: product can be produced in 4 colors. I need checkboxes for every color on product form.
I have read docs about Phoenix.HTML.Form, but I have found only select/4 and checkbox/3.
It is not very suitable if there are a lot of cases. And checkbox/3 is only for 1 case.

Does someone know if there something like select + checkbox in Phoenix?
Thanks!