Hello, can you give me an example for getting a value from python to javascript?

I always get across browser origin error.

I tried to get a value from this:

.py

@http.route('/custom/test', type='json', auth="public", methods=['POST'], website=True)

    def person(self, lastname, firstname):

        headers = {'Content-Type': 'application/json'}

        create_user_url = "http://localhost:8090/custom_custom/user"

        data = {"jsonrpc": 2.0, "params": {"lastname": lastname, "firstname": firstname} } 

.js

if (result) {										    session.rpc('/custom/test', {											        lastname : // how to get the data from python?											        firstname: // how to get the data from python?											    }).then(function (result) {												        console.log("print user")
     });
}