'Route multiple IPv6 /64 subnets of a VPC to a single AWS EC2 instance

If I have an AWS VPC with an IPv6 prefix of 2001:db8:abc:de00::/56 allocated to it, how do I route the entirety of two /64 subnets to an EC2 instance?

VPC:      2001:db8:abc:de00::/56
Subnet 1: 2001:db8:abc:de11::/64
Subnet 2: 2001:db8:abc:de12::/64

EC2: Subnet 1 + Subnet 2

I want the EC2 instance to be able to send and receive traffic from any of the address inside of Subnet 1 and 2.



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