Delivery Server based on "List custom fields"

As stated in the title, is it possible to declare a delivery server for a campaign's subcriber via a custom field of that campaign?

E.g. I add to my list "EasterEggs" the subscriber via API and also set-up the value of the custom field "DSERVER" of this campaign for this specific subscriber to e.g. "SES", would it be possible then to use Amazon-SES as DS for this subscriber and e.g Sendgrid for another subscriber that has "Sendgrid" in the appropriate custom field?

That's not possible, the only thing close to it is to simply assign the servers to the campaigns.