Default font weight from customizer should be choosable in Grid/Carousel block

I have defined the website title fonts carefully in customizer. I'd like to use those also in Post Grid/Carousel block, but I can't concerning the font weight. There is only "bold" and "normal". IMHO there should "default" as the first option. Many fonts have 4 or more weights and they can be defined in customizer. One would expect perhaps the "normal" be the default, but it's not. Support told me that when nothing is chosen the default is used. But if you for example try bold, there's no way to go back to default styles.