This is now supported in ACI as an automated process - please see https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/getting-started/cisco-apic-getting-started-guide-52x/apic-gsg-new-and-changed-information-52x.html
Can you take a look at this and see if this is helpful:
http://www.cisco.com/c/en/us/td/docs/solutions/Hybrid_Cloud/Intercloud/CSR/AWS/CSRAWS/CSRAWS_4.html