Block youtube's (and other website's) embeds on lemmy posts. (uBlock related)

So when you want to post a lemmy post, it asks for a URL, if you provide a URL of, say, youtube or bandcamp an embed will load when you enter the comments section.

Basically I want this

into

And if anyone knows how to block all images in general, except from a few whitelists (lemmy sites, catbox, etc) that would be really helpful.