AppleScript - "Close tabs to right of current tab" in Google Chrome

This following AppleScript code should accomplish what you are trying to achieve.

This will close the tabs to the right

try
    tell window 1 of application "Google Chrome" to ¬
        close (tabs -1 thru (active tab index + 1))
end try

This will close the tabs to the left

try
    tell window 1 of application "Google Chrome" to ¬
        close (tabs 1 thru (active tab index - 1))
end try

Frame challenge…
I've no idea how to fix the Applescript, sorry, but this seems something of a heavy-handed approach to a function that's already in the menu & can therefore be triggered directly by a simple key command.