Widgets transparency over different application with not compositor

  • Hi, I have 2 qt applications. One is on top of the other and it is made using several widgets.
    I want this widgets with a transparent background (possibly without a compositor) but I'm not having success.
    I have tried css and window flags but it doesn't work while if I create a custom widget with the second application as parent it has a transparent background (using css rules).

    Is it a way to arrange this?

    APPLICATION1 ON TOP: widget1 widget2 widget3 * (I want them transparent but they aren't in order to see the application 2 background through them)*
    APPLICATION2 UNDER: widget4 (I don't want it transparent but it can be)
    APPLICATION2 BACKGROUND: * (this is visible through widget4 if I make it transparent)*

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