Poor man's integration with ServiceNow

[Milo Grika]

We have a short-term need to integrate with a customer's ServiceNow instance and therefore don't want to invest in API development or subscribing to an add-on or platform solution.

Wondering if anyone has had success creating and updating tickets in Jira Service Desk and updating tickets in ServiceNow through email alone.

We do have our SD set up to create tickets from email and I see that ServiceNow can be configured to send out emails.

Is this even possible given how Jira emails out via Request participants? If so, how, and basically the same question for ServiceNow.