Feature request: load italics

I would like to be able to check a box in the Customizer to indicate to load the italics styles of the fonts.

The workaround for now is to directly edit /includes/fonts.php to include the italics styles in the weight. For example:

'Titillium Web' => array(
			'name' => 'Titillium Web',
			'family' => '"Titillium Web", sans-serif',
			'weight' => '400,700,400italic,700italic',
			'sets' => array( 'latin', ),
		),

https://ww.wp.xz.cn/plugins/styleguide/