How can I integrate an external XML sitemap with my online store?

[RH_TB]

Hello,

I am aware of the automatically created XML sitemaps and have those summitted to Google Search Console without any issues. However, we have an external sitemap related to our stores search/facets (we don't use collections) that gets generated outside of Shopify. Is there a way to integrate this external XML file to Shopify? I am also unaware of a way to add the file directly to Google Search Console since it requires you to submit the sitemap URL and it must contain your domain name. In other words, I can't host it somewhere else. It would need to be hosted somehow on Shopify from what I gather.

Thanks in a