pre-construct slots?


I’m working in a tabs widget to create any numbers of tabs.

I’m using a switcher to change tabs when buttons are clicked and is working fine, I can create any number of tabs and tabs are changed when tab button in clicked.
But I have a problem, I wish to add a named slot when a new tab is created (it’s called at preconstruct)

But when I use my tab widget in other widget, dynamic slots not appears

If I construct other type of child, button, slider, box… it’s working fine all tabs have it’s child button.
If I add manually slots to my tabs widget, parent widget detect tabs slots.

But I can’t create slots dinamycally and that appears in other widget ehen I add my tab widgets

Is possible?
There is another approach?

Thanks in advance