Sorry, there isn’t anything that will do that. It would be a privacy problem because it would allow arbitrary apps (and even code on other computers, since you’re asking for a network socket to be exposed!) to snoop on your web browsing.
On Mac OS you can write a Safari or Chrome extension that runs inside the browser and can look at what pages are loaded, and the contents of those pages. Maybe that’s the sort of thing you’re looking for. (I don’t think you can write these in Swift though, only JavaScript.)
On iOS browser extensions aren’t supported, so you can’t do anything like this.
Anyway, this is not a Swift language topic, so it’s not relevant to this list — you’d be better off asking for help on Apple’s or Google’s developer forums for browser extension development.
—Jens