I don't think it's possible with the marker you are using (this particular marker does not have parameters for Marker Position and Offset as others do). Door Marker 11 does not allow you to place the WxH in a single line of text, and Door Marker NCS 11 does not show the door size (unless you insert it with a Custom value).
MacBook Pro Apple M2 Max, 96 GB of RAM
AC27 US (5003) on Mac OS Ventura 13.6.2
Started on AC4.0 in 91/92/93; full-time user since AC8.1 in 2004