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The only way to do it today on AWS side is via allowed prefixes on DXGW with TGW (not in all Regions yet): https://docs.aws.amazon.com/directconnect/latest/UserGuide/allowed-to-prefixes.html
To give you an idea, VPC could have 2 CIDR ranges. Primary used for EC2 and the other for CIDR for containers. You'd only allow (originate) the primary prefix on DXGW in this case and the other CIDR would not be advertised.
Customer of course could always just filter out whatever CIDRs they don't want on their end. Fairly trivial but you'd want to use at least 2 x CIDRs in your VPC to make their life simpler.
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