Limit coupon with user role

Hello,
I use the B2BKing plugin to manage BtoC and BtoB customers. This plugin adds a field in a coupon created in Marketing where I can choose the allowed role. But this field is not in the coupon settings in your plugin. How can I do ? If the user email address is already saved as BtoB, this customer cannot add the coupon code in his order.

Thanks a lot