Err.. but I'm not talking about placing entities at absolute positions. egui supports that - that's how we get one widget in the center of the screen :)

I'm talking about having two labels in the center of the screen, making them full width, making the text word wrap, and having each label flow properly when resizing the window. That requires calculating word wrap for each label plus knowing where labels visually higher on the y-axis have decided to place themselves after considering word wrapping. Labels beneath other labels should get pushed downward when word wrapping occurs.

That seems really hard to achieve in immediate mode libraries without effectively recreating retained mode functionality yourself.