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Hello @andi2021,
Thank you for your query and we are so sorry about the trouble this must have caused.
Unfortunately, we don’t have a filter code to include the image:title tag. You can modify the incoming image object of a post URL for your sitemap entry using the filter code below but it is unlikely that our sitemap will accept image:title when you insert it into the image object:add_filter( 'rank_math/sitemap/entry', function( $url, $type, $object ){ return $url; }, 10, 3 );
You may refer to this guide on how to add the code to your website:
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.