Check this doc out. “Yes, you can do it.” In short, you need to hide the initial window and then display your application in a lightweight window.
Also - note: on a Mac - the behavior is different. By convention, the window does not appear in the "taskbar" when it is displayed. When it is minimized, it is in the bar. To hide the application when it is minimized on a Mac, you should make the window “invisible”, not minimize it. The dock mentioned above gives more details.
The key part of the document for your case:
In the Windows operating system, windows created using the type utility or light weight are not displayed on the taskbar. Invisible windows also do not appear on the taskbar.
, , - , , , .
, autoExit NativeApplication - false . - , false ( visible true activate() ).
, , NativeWindowInitOption NativeWindowType.UTILITY NativeWindowType.LIGHTWEIGHT.