How do I know if "Notify watchers" was checked?

I’m getting a webhook when page is changed (or created etc.) and I’d like to know if “Notify watchers” was checked when page was saved. No information is given in the webhook. I can try to access Confluence API and fetch the newly created version where I can find “minorEdit” property but it seems to be false always and not to represent whether “Notify watchers” was checked.

Any ideas?