Owner field
I am using the Create Task flow step for the first time. I am wondering if I can use a token in the "Owner:" field?

I am using the Create Task flow step for the first time. I am wondering if I can use a token in the "Owner:" field?

Alas, just tested and a {{lead.token}} with the SFDC ID of the Owner doesn't work.
What you can do as a workaround (and it is annoying) is include the desired Task Owner in the Task Description (which does support {{lead.tokens}}) and then use Flow, Process Builder, Apex, etc. in SFDC to parse that out and transfer the ownership.
You'd want to assign the Task to a placeholder User to start with, so the Contact Owner never is bothered by it.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.