Hello,
I'm trying to create a UniqueValueRendererDefinition that uses the OBJECTID as a value. However, Pro does not give this option by default, and it also does not work in the SDK if I give OBJECTID as the value field (It uses some other field instead). In Pro, I would solve this by going into symbology and setting the field to an expression and selecting OBJECTID:

How could I do this using the SDK? My hunch is it will be something relating to the CIM, but I can't find any resources for this online.
Thanks!