Adding italic variant Google font

Hi, Support.

I added the filter for a Google font that is not in your theme (added it in the functions.php of the Child theme). The font is loading correctly, but I cannot get the italic to load. I have tried adding '400italic', '700italic' to the variants with no luck. Can you help?

This is the font I'm adding: https://fonts.google.com/specimen/Aleo

And this is the code I have added to functions.php:

/*add Aleo font*/
add_filter( 'generate_typography_customize_list', 'tu_add_google_fonts' );
function tu_add_google_fonts( $fonts ) {
$fonts[ 'aleo' ] = array(
'name' => 'Aleo',
'variants' => array( '300', '300italic', '400', '500', '700', '700italic', '800', '900', ),
'category' => 'serif'
);

return $fonts;
}