Unable to find a way to set up emails that alert users to task approvals

I have a situation where a team wants to have folks who don't do there day-to-day in Workfront receiving task alerts in sent to their work email accounts. The people we are wanting to do this for aren't using Workfront much, if at all, in their normal day-to-day. But the team that is looking into this does, and they need a means to track project proposal approvals inside of Workfront. However, I have not found a way to send task alerts to anyone's email via the email notification system Workfront has. I have seen a few things here and there that look like they are looking to do something similar, because a notification inside of Workfront isn't always effective for one reason or another.

So:

Bob is a group admin in Workfront.

Joe is his director, and rarely, if ever, uses Workfront.

• Bob is sent a proposal request through Workfront.
  • Bob converts it to a project and then begins adding tasks
  • Bob needs Joe to either approve, or deny, this proposal
    • Bob creates a task that says "Approval required by Joe"
  • Joe gets a notification alert in his Workfront environment to approve/deny the proposal.
    • Joe is unaware that Bob has created a task that requires his approval because he spends most of his day in other services, or emails.
• How can Bob send Joe an email alert about the task requiring approval from Workfront? Is this possible without complicated development (for example Workfront Fusion)?

Thank you.