I published an article in VMware Docs some time back, covering various possibilities of configuring DNS for VMware Cloud on AWS. Use the below link to access the article.
The article covers the configurations for NSX-V based SDDCs, and a separate article covering the new steps for NSX-T is on its way. Subscribe to the VMC Release notes to keep abreast of the latest. Also, refer “Determining Whether Your SDDC Networking is Backed by NSX for vSphere or NSX-T”.
Do let me know if you would like to see any additional details related to DNS setup for VMC.