I get the feeling those aren't actual integrations? They are just intended to modify the Jupyter keybindings. They have nothing to do with Vim per se, I think.
It *is* possible to enable Vim to act as a stateless "poor man's notebook". Grab text with a motion in the usual way, and then run something like this:
silent exec "r ! " . escape(@", "%!#\r\n")
Combined with opfuncs and omaps, you can set it up so that pressing Enter will execute the current line and place the output just below the current line, similar-ish to Jupyter.
But I suspect this isn't what you had in mind by "integration".
A