Is there a keyboard shortcut for opening a tab in a new window on Chrome?
Shift+W opens existing Tab in a new window. Tested on several Chromium based browsers at Windows 10
If you want to open a new tab in the same chrome window simply press Ctrl+T
Assuming you don't indeed want to keep the same page opened twice in existing window + new window, you can simply drag & drop the tab out of the current browser window, opening a new one with only this tab. I've tested this with Edge, Firefox and Chrome and the behavior seems to be consistent across these browsers.