[ianakarina]

Well, I managed to do it by myself, even though I’m not a programmer. It would be nice to add it in future updates.
Thanks in advance!

// Enqueue google fonts with subsets separately
	foreach( $gfonts as $i => $gfont ):
		if ( strpos( $gfont, "&" ) === false):
		   // do nothing
		else:
			wp_enqueue_style( 'fluida-googlefont' . $i, '//fonts.googleapis.com/css?display=swap&family=' . $gfont, null, _CRYOUT_THEME_VERSION );
			unset( $gfonts[$i] );
			unset( $roots[$i] );
		endif;
	endforeach;

	// Merged google fonts
	if ( count( $gfonts ) > 0 ):
		wp_enqueue_style( 'fluida-googlefonts', '//fonts.googleapis.com/css?display=swap&family=' . implode( "|" , array_unique( array_merge( $roots, $gfonts ) ) ), null, _CRYOUT_THEME_VERSION );
	endif;

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