So I forgot to mention that this is only concerning the Blog Posts of the CMS section
Basically we have a custom iframe to embed fonts and it should work like any CodePen or Youtube video link.
For example, this a url that can work woth oEmbed:
And here is the oEmbed response https://oembed.fontself.com/?url=https://catapult.fontself.com/MEdLOEq/gilbert-color-bold-preview4
Here is a CodePen url that works:
Basically does Webflow has a whitelist or is using Embed.ly or parsing the metadata when using this “Paste a link to embed rich content” input?