Can I call python function in JS or do the reverse?

Anki offers a JS → Python bridge via pycmd (internal name bridgeCommand) that allows sending string messages to the Python side.

See the add-on hook webview_did_receive_js_message for instructions.

You can directly use the return value of JS code with AnkiWebView.evalWithCallback. For example, the DeckBrowser gets the page y offset and uses the return value in its callback:

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