pywebview Load html, css and js into DOM

I would like to know how to insert css, js and html into a DOM. I have a css js and html file that should be loaded into the DOM after calling a URL.

does anyone have a tip on how to get this done ? i have the DOM itself yes can load via

import webview

def change_dom(window):
    result = window.evaluate_js("document.documentElement.outerHTML")
    print(result)

if __name__ == '__main__':
    window = webview.create_window('URL Change Example', 'https://www.amazon.de')
    webview.start(change_dom, window)

Thought to myself if I just insert the whole thing with BS4, but don't know if the way is not too cumbersome.

Thanks in advance