How to bridge the MQTT TTN broker to the AWS Broker?

I got a working setup with a amazon EC-2 server with mosquitto MQTT broker to bridge to AWS
But how can I now bridge the TTN broker to AWS ?
Is there a way to point my client on the EC2 server to TTN and bridge it to AWS.

Mosquito Broker(EC2) ----------------AWS Broker
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Mosquito client (EC2)

I need:

TTN Broker ------?(EC2) ----------------AWS Broker
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Mosquito client ?(EC2)
Any Ideas to realize this ?