Gtk_drop_target versus gtk_drop_target_async

In my code I am using

const char *mimeTypes[]={"text/uri-list", NULL};
auto contentFormats = gdk_content_formats_new(mimeTypes, 1);
auto dropTarget =gtk_drop_target_async_new (contentFormats, actions);

This works fine most of the time. Nonetheless I would rather use the nonthreaded version

auto dropTarget = gtk_drop_target_new(Type, actions);

Does anyone know if it is possible to set up the contentFormats as a GType and how that is done? If you do know, it would be nice if you could share that piece of information.

Thanks.

Thanks to Matthias:

The clipboard example in gtk4-demo use GtkDropTarget and sets formats.

If anybody else has this doubt in mind.