Adding "Activate the extension" shortcut to Chrome Extension

I am developing a Chrome Extension for personal use and want to add a shortcut to it to activate to popup.html page (i.e. when I press the shortcut the popup.html page will show up).

For some extension I can easily do this by going to chrome://extensions/shortcuts page and assigning a shortcut against "Activate the extension" field.

But my extension is not listed there.

Do I need to add anything to the manifest.json file for my extension to appear in chrome://extensions/shortcuts page?

Thanks to Yu Zhou for sharing this link in his comment. It helped me to make the "Activate the extension" thing to work.

To make the extension available in chrome://extensions/shortcuts you need to add the following in manifest.json -

"commands": {
    "_execute_action": {
        "suggested_key": {
            "default": "Ctrl+Shift+Y"
        }
    }
},

But doing only this doesn't make the shortcut assigned to actually work. For that you need to add a background.js page -

// in manifext.json
"background": {
    "service_worker": "background.js"
}

// in background.js
chrome.action.onClicked.addListener((tab) => {
    //TODO toggle dark mode in the tab
});

I am still unclear on how all these are making the popus.html to activate but it is working now.

P.S. this is for manifest version 3