Univention portal - change bind IP address for virtualhost

I would like to run various services in docker which is shipped with UCS. For that reason, I added additional IP address via UCS network settings, and I want to use any port on that second IP address.
Problem is that Univention portal is now available on on second IP address and standard ports which I want to use. Docker error example:
listen tcp 192.168.10.121:80: listen: address already in use
I changed apache2 configs to
<VirtualHost 192.168.10.120:80> and <VirtualHost 192.168.10.120:443>
That did not work. Any UCS way to do this?

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