FWIW, ChatGPT's response:

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To specify the "new" part of the --headless=new flag in Python, you can use the add_argument method of the Options class from selenium.webdriver.chrome.options.

Here's an example code snippet that shows how to use it:

    from selenium.webdriver.chrome.options import Options

    options = Options()
    options.add_argument('--headless=new')

In this example, the add_argument method is used to add the --headless=new flag to the Options object. This will enable the "new" headless mode in Chrome.

Note that this flag is only available in Chrome version 87 and above. If you're using an earlier version of Chrome, this flag won't work.