I found this quote from Steve Williams in 2011. Is it still true?

currently, the product only supports the ability to see Proxy
Assignments based upon the ID you select. I believe there is already an
Enhancement Request entered for that.
At this time, the only way to create Proxy assignments is in the
UI. This is not exposed via WF, SOAP, or REST. That too is in a list
of items to add.

I cannot find an attribute affected by a delegate assignment. Am I
missing something?

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