og_image_width and og_image_height hook not working with cdn image

Hello Rank Math support team,
I am trying to customize the Open Graph image width and height for an external image with a CDN on my website. To achieve this, I have added the following code to my rank-math.php file:

add_filter( "rank_math/opengraph/facebook/og_image_width", function( $content ) {
	$content = '1000';
	return $content;
});

add_filter( "rank_math/opengraph/facebook/og_image_height", function( $content ) {
	$content = '1000';
	return $content;
});

However, I have noticed that the og:image:width and og:image:height tags are not showing up in the source code when I view the page. Could you please help me determine why the filters are not working as expected and how I can resolve this issue?

Thank you for your assistance.