How to easily select and copy entire page

I have a rather large page whose entire contents I would like to copy as rich text. Normally I would select all the blocks on a page and press ⌘C, but this page is pretty big so even just selecting all the blocks on it is kind of annoying. I would think that ⌘A (pressed enough times) would select the whole page, but it only selects the current block.

So, is there some way to just copy an entire page as rich text? The equivalent of selecting all the blocks on the page and then pressing ⌘C, without actually having to do that?