BriskBard, CEF4Delphi, WebView4Delphi, WebUI4Delphi and WebUI4CSharp

C# or
In the case of Python
Supports external debugging port.
EX)

debugger_address = gl.start()
chrome_options = Options()
chrome_options.add_experimental_option("debuggerAddress", debugger_address)
driver = webdriver.Chrome(executable_path=chrome_driver_path, options=chrome_options)
driver.get("http://www.python.org")

However, like Selenium, it has the ability to connect directly to an external browser as a client.

I need a Delphi implementation of that.

Try this :
https://www.briskbard.com/forum/viewtopic.php?p=8904#p8904

That can't be run externally.

https://github.com/gologinapp/pygologin