How to load different font-weights for open sans

Hi,
how is it possible to load different font-weights for open sans such as 100,200,300?
I have tried the solutions mentioned here before to edit the

class-avia-type-fonts.php line 726: Open Sans => Open Sans:200,300,400,600

and

add_filter('avf_blog_style','avia_change_tag_blog_layout', 10, 2); 
function avia_change_tag_blog_layout($layout, $context){
if($context == 'tag') $layout = 'single-small';
return $layout;
}

add_filter( 'avf_google_heading_font', 'avia_add_heading_font');
function avia_add_heading_font($fonts){
	$fonts['Open Sans'] = 'Open Sans:100,200,300,400,600,700';
	return $fonts;
}
	
add_filter( 'avf_google_content_font', 'avia_add_content_font');
function avia_add_content_font($fonts){
	$fonts['Open Sans'] = 'Open Sans:200,300,400,600,700';
	return $fonts;

both are not working.