Nested parameters

I have a template used in several build configurations created based in the same conventions. Each build configuration has more then one vcs configured.

I would like to define a parameter in the template using other parameters to get the project name and configuration name e.g. %system.build.vcs.number.%system.teamcity.projectName%_%system.teamcity.buildConfName%%

Is it possible to have parameters like this?

In the example above I would like to get the commit hash of the "main" vcs, but I have other parameters in my template that I would like to use the same approach.