I often get client emails containing 10 or more tasks written as text in the email.

I know Outlook and Gmail let you turn an email into a single task, but this doesn't help too much when there are 10 tasks in that email.

Are there any plugins for Outlook or Gmail that let put checkboxes into the email or something so I can check off each item as they are done?

Ideally I'd like the checkboxes/to do items to be inside the email itself so I can see my progress by looking at the email, rather than just letting me copy text from the email into some other task list.