Add tags when adding a contact

How do I add contact tags when adding a contact via API. Tagging is an important part of our segmentation and I want to ensure that when contacts are added, they are tagged appropriately.

This code works:
{
"contact": {
"email_address": "email@email .com",
"first_name": "first name",
"last_name": "Last Name",
"phone_number": "123456789"
}
}

How can I add a Tag in there. Say I want to tag the contact as a "Facebook lead" or something like that?