Open remote debugging mode in an already open chrome browser

I am trying to open "remote debugging mode" in an already running chrome browser.

Here is the command I am executing:
chrome.exe --remote-debugging-port=9222 --user-data-dir="C:\Users\Ideal\AppData\Local\Google\Chrome\User Data"

But when I visit http://127.0.0.1:9222/json/version, nothing shows up.

However, if I close the browser and then run the same process, then http://127.0.0.1:9222/json/version works great.

So how can I open remote debugging mode in an already running Chrome browser?