how to create Shadow Dom by BeautifulSoup?

I want to create Shadow Dom of a HTMLelement in python

div = bs4.BeautifulSoup("<div></div>","html.parser")

what's the next step?

In javascript, I can create Shadow Dom by the method attachShadow

const Host = document.createElement("div");
const root = Host.attachShadow({mode:"open"});

how to do it in python?