Available on eu-north-1 (Stockholm)

NetBSD 11.0 amd64
ami-0145cddb5cf345869
NetBSD 10.1 amd64 by drixter@e-utp.net (ec2-user)
Architecture: x86_64
Root device type: ebs
Virtualization: hvm
ENA enabled: Yes
Boot mode: legacy-bios

NetBSD 11.0 Arm
ami-0145cddb5cf345869
NetBSD 11.0 Arm by drixter@e-utp.net (ec2-user)
Architecture: arm64
Root device type: ebs
Virtualization: hvm
ENA enabled: Yes
Boot mode: uefi

Available on eu-central-1 (Frankfurt)

NetBSD 11.0 amd64
ami-0cf4a39aa5be88c2f
NetBSD 11.0 amd64 by drixter@e-utp.net (ec2-user)
Architecture: x86_64
Root device type: ebs
Virtualization: hvm
ENA enabled: Yes
Boot mode: legacy-bios

NetBSD 11.0 Arm
ami-0d74af44a2f94f069
NetBSD 11.0 Arm by drixter@e-utp.net (ec2-user)
Architecture: arm64
Root device type: ebs
Virtualization: hvm
ENA enabled: Yes
Boot mode: uefi

Available on us-east-1 (Virginia)

NetBSD 11.0 amd64
ami-04b3fd43f30b85024
NetBSD 11.0 amd64 by drixter@e-utp.net (ec2-user)
Architecture: x86_64
Root device type: ebs
Virtualization: hvm
ENA enabled: Yes
Boot mode: legacy-bios

NetBSD 11.0 Arm
ami-0f9369fa3f85b9845
NetBSD 11.0 Arm by drixter@e-utp.net (ec2-user)
Architecture: arm64
Root device type: ebs
Virtualization: hvm
ENA enabled: Yes
Boot mode: uefi

Created using information from here and here.

Tested and working.