Exclude custom posts from sitemap programmatically

Hello,

I have a custom post type which has a field “has_detail_page”, which can be set while editing a post of this type.

Now I would like to exclude posts which do not have a detail page, exclude from WordPress.

Of course I could add those posts manually to “Posts to exclude” field in sitemap configuration. But this is not very comfortable.

Is there a filter before the post is outputted to the sitemap?
Or, if it does not work with a filter, do I have the possibility to fill “Posts to exclude” programmatically?

Thank you!

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