Currently, there isn't a provision to import campus/ area maps. Instead, you can define areas, subsequently add nested areas and add buildings under the area by providing the lat and long. DNA Center aligns the buildings under the parent area and pos...
Is your CMX integrated with DNA Center?
https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center-assurance/1-3/b_cisco_dna_assurance_1_3_ug/b_cisco_dna_assurance_1_3_ug_chapter_01010.html
Here are a couple of Cisco Live presentations that might help better understand DNA Center.
1. SDN and Network Programmability
2. SDN with Cisco DNA Center