Linked Pull Request Event Webhook for Issues

Hi,

Is there a webhook action event related to a pull request being linked to an issue. I would like a webhook which attach to the event when an issue has a pull request referencing it, ergo the “Linked pull requests” section will have the pull request listed.

Looking at the issues webhook payload here I cannot see an action which specifies when a pull request is linked. There is opened, edited, milestoned and even demilestoned but none related to pull request linked.

Thank You