Docker deployment command not reflected

Hello,

RM 2017.2.4

I'm in Run > Edit configurations > Docker deployment ... Container > Command... and I want to specify --net=host. I just put it like it is --net=host but in real in the container when running some test it is not reflected. Also tried via json with no luck. 

Please is there some special way how to write these parameters of container?

Thanks
Ondrej