Hm, I'm not seeing how I'd do it. I can do embeds for youtube and twitter, based on just a link to the page there. What you just posted in a lot of HTML which I'd have to parse, etc (not really doable given all the other stuff going on).
If I could figure out the embed from just the link, eg:https://www.reddit.com/r/WhatsWrongWithYourDog/com...
...maybe. But, not all reddit posts have videos, images, gifs, etc. So, I just see problems with this.
Embed in general cause issues too. The twitter one messed jump-to-new stuff because it's height varies and can't be predetermined like youtube and images can.