DAC/Headphone amp + UR44c aggregate device combined outputs in Control Room

Hello,
I currently use a UR44C audio interface with Cubase 13 pro, and route two stereo outputs in Control room to the 1) main out and 2) headphone output. I am planning on purchasing a DAC/headphone amp and am trying to understand if it is possible to combine this DAC with the UR44C as an aggregate device and route the UR44C main output to one Control Room output and the DAC output to another Control Room output, so that the end result is effectively the same as I had when only using the UR44C, but with a high quality DAC in my headphone monitoring chain. If this does not work, of course I can bypass the DAC in the headphone amp and route the second UR44C stereo output to the headphone amp.