RabbitMQ with MQTT

I was able to use the RabbitMQ stack from the catalog successfully, but I was wondering how can I create/modify my stack so that RabbitMQ also uses the MQTT plugin?

I am fairly new to Rancher and docker, but I was able to find and use other person’s docker image that enables MQTT in a normal docker container, but how can I use that image in the Rancher stack?

I did find the original repo for the Rancher stack here but couldn’t determine how to modify it to include the MQTT plugin.