Can a Word Add-In Capture Custom Parameters Passed in Word URl?

Question

I'm developing a Word add-in tool that navigates to a bookmark based on its name. I aim to pass a custom parameter to specify the bookmark name, but I'm unable to find a method to achieve this.

The 'context.document.url' only provides the document's path URL and doesn't include any custom parameters passed.

Is there a method to pass a custom value to my add-in? I don't want to add the bookmark as a metadata in my file, as the bookmark name may vary depending on the user's selection.

Thanks for helping!