Bridesmaids I've Never Actually Met

My FH has two cousins that he is close with that he would like to have in our wedding (I'm fine with that). He's already informally asked them and they will be bridesmaids standing on my side. I haven't asked my girls yet and would like to include his cousins. They're not local to us and I've never actually met them in person. How do I include them in the bridesmaid proposals? I've though about leaving it up to FH but I want it to be official so that everyone can be aligned. I'll more than likely be sending proposal boxes since not everyone is local and can't really plan a dinner. I feel I can't really use the usual wording of proposals referencing besties, etc since we're not lol... help!