How do i get custom fontSizes and theme fontSizes?

Use useSettings() since useSetting() is deprecated.

Then, you can specify a further path with custom or theme to state what data you’d like to get:

// User-created presets.
useSettings('typography.fontSizes.custom');
// Theme-defined presets.
useSettings('typography.fontSizes.theme');

See this WordPress Playground for a working example.

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