Change layout of project wizard

I want to develop a plugin that creates a new project with a defined template. The template is already integrated successfull. What i want to achieve is, that you can select over the project wizard different types of templates to generate the project.

So i already know that you can achieve this with the ModuleBuilder and WizardSteps to change the layout of the project wizard. But i don't know where to add these components, so that it is shown in the intellij gui.

The wizard looks like the following now. I want to add some options instead of mvvmFX Application.