Font resource weight

In the i for the font resources there are only 8 font weights to choose. The option ‘Thin’ is not available. Is this intended?

If I change the weight of the font, for example in a Text Component, then there are 9 options, but the last one ‘Black’ seems not to work: I see no difference between Extra Bold and Black.
I have all the 9 weights in the resource folder and added to the theme, so I assume Black should be available.