Can you search Gmail messages by who was the delegate?

Gmail’s Delegate and collaborate on email allows adding delegates who are able to access someone else’s mail box and read, delete and send from there. It states:

You can add up to 10 delegates. If you’re using Gmail through your
work, school, or other organization, you can add up to 1000 delegates
within your organization.

Is there a way to use search operators to find only messages that were sent by a given delegate?

Examples that don’t work (the latter two are what is actually shown in the full headers):