Graph fonts

<GraphProvider
  fontList={[
    { id: 'custom-serif', label: 'Custom Serif', fontFamily: 'Garamond, serif' },
    { id: 'custom-sans', label: 'Custom Sans', fontFamily: 'Helvetica Neue, sans-serif' },
  ]}
>
  {/* ... */}
</GraphProvider>

<Graph
  config={{
    appearance: {
      textStyle: {
        heading: { fontId: 'custom-serif' /* color: '#1a1a1a' */ },
        body: { fontId: 'custom-sans' /* color: '#4a5568' */ },
      },
    },
  }}
/>