My understanding is that you want to send an email to team members by adding team members into the "to" field. There is no OOB way to achieve that, i would suggest to write a custom workflow activity+WF or Plugin to populate team members into the "to" field.
If the case you show above,
- You can have a team field on Email form
- WF/Plugin would retrieve the team members and populate the team members as To
If you use a queue, queue will have an email address, and the email will go to that email address, that email address needs to be a group email address. So, it will be like team@team.com, not like teammember_a@team.com, teammember_b@team.com, etc.
Regards,
