How to add a callback-plugin to AWX docker

Archives AWX Project
1

Installed AWX docker from here - https://github.com/ansible/awx. I am trying to add a callback-plugin for a specific project as written here - https://docs.ansible.com/ansible-tower/latest/html/administration/tipsandtricks.html#using-callback-plugins-with-tower. Does not work. I add to Template-> EXTRA VARIABLES lines:

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2

Did you ever find a way to get this working?

thanks
Jeremy