It's great that they are investing in Gnome but I don't think adding progressive Web apps into Gnome is something anyone asks for.
Rather I would put money into evolving Gnome with new features like system76 guys are doing with their own desktop environment in Rust.
Or Glade replacement efforts, it is hard to consider Gtk 4 a modern toolkit when GtkBuilder requires building its gigantic XML files by hand.
This is a much bigger task then this can fund. There is already Cambalache which is basically GTK4 Glade. There is Blueprint which is an XML replacement. And Red Hat may fund a new UI designer in the coming years.
Cambalache is still a prototype, using web widgets as kind of work in progress, with the author asking for sponsorship to actually fully port the Glade functionality into it.