Docker client start script does not support totp

I am trying use https://hub.docker.com/r/guacamole/guacamole latest docker image in my production. I have set env variable - TOTP_ENABLED=true and drop downloaded jar file into /opt/guacamole/totp folder but this is not working after container start. The image start.sh script does not contain associate_totp() function. Is it possible to release docker image with totp support?