Hello Chris,
DAC is supported on the co-processor connector, however it’s IDAC, i.e. converts to a constant current (range 0.05 μA and 64 μA) rather than a voltage, so may not be suitable for your needs (at least without changes). Here’s the datascheet: https://www.silabs.com/documents/public/data-sheets/BGM111_datasheet.pdf#unique_2
Regards,
Scott