This isn't possible. The service group definition only accepts three lines: servicegroup_name , alias, and members.
The servicegroup definition is just for making the display in the CGI's prettier.
For you, i recommend making different service templates. Make a template for each group of services you have, each with your different contact groups. Then in your service statements:
service_description Operations Server 1
service_description Development Team server 1
etc etc... read the docs.