Just thinking out loud as someone who's been in a similar situation...

There are a ton of tools that claim to be one stop shops, but of course, almost none have all the features you would want.

Hence it makes sense to separate the different parts (to use tools that are excellent/powerful at any one task), and use some intermediary in the middle. Of course this isn't as efficient and frictionless as possible, but it allows compatibility.

I suppose in today's "everything is a file" computing paradigm, files (or folders) with data are probably the closest? It is far from perfect, but it's possible to integrate with a bit of legwork with scripts and the like.

That way you can import from your browser/extension of choice, save it in a form (.md? .odt/docx?) of choice, and export it as you please (ppts or pdfs? webpages?).