To create this type of forwarding you need to use
Flow preferences > Internet traffic, but as you may have already noticed I can't specify target applications, I can only work with the IP or a range of IPs.
So I don't see a way to do what you want.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.