How to add testing library to Intellij Idea Create Test pop-up

Question

In Intellij Idea when I press CMD+Shift+t I see this:

After pressing Enter I see new window with possibility to choose test library

If I need to add here Spock framework, how can I do it? Groovy plugin is enabled, I have latest version of Idea.

Interesting thing that I can run existing Spock tests and everything is working good, the only problem is that I have to create test file manually.