How to register Custom Controller for BuildTypeTab

I have a custom BuildTypeTab extension that have same url as all tabs in build section: /viewType.html
In this tab, user can configurate my plugin.

How can i register Custom Controller via

webControllerManager.registerController if paths are conflicting?

Logs tell me that jetbrains internal controller is already registered to /viewType.html.
I need to handle post request from my form and it is not possible without Custom Controller.

Is it even possible?

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