Tumblr supports RSS feeds (https://YourURL.tumblr.com/rss). It quite good but the RSS provides a Hyperlink to view your artical. Which takes the user to Tumblr website instead of Mumblr website. I would love the link to go to my website with Mumblr. Not sure how you going to achieve this tbh. As you have no control of Tumblr but throught I would ask. Might be worth me reviewing the aritcal connect instead to achieve this goal. Thanks for all the hard work.