MQTT BIRTH - Setting Ignition Tag Properties

Just wondering if anyone knows how to set the Tag Properties in Ignition from the NBIRTH or DBIRTH message_type elements (or other method)? I have an EoN device that is not Ignition, but would like to send up some information to Ignition to provide more Meta data about the Tag. Example might be to add some description to the Documentation property of the Tag or Units of Measure (Engineering Units).