Chart guide config does not respect fontSize property

[KosGrillis]

Attempting to set the font size of a chart axis via the guide config:

          guide={{
            x: {
              fontSize: 12,
              label: {
                hide: true,
              },
            },
            y: {
              fontSize: 12,
              label: {
                hide: true,
              },
            },
            showGridLines: 'x',
          }}

Simply does not work. The axis tick labels do not change from their default font size of 10