You should have informed this at the beginning of the topic, but here we go.
On the DHCP configuration page just add a custom option.
And use that site sent earlier to convert the decimal IP to hexadecimal.

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.