Hey Crew, the feature request is in place for this, but as @HenryPinera stated, keep making wishes for it, that does have an impact if we do it in concert. I'd suggest making the wish from the corresponding DHCP page in Dashboard so the wish analytics tools properly categorize it.
And even better, send a quick email that you need this and how you intend to use it, and get it to your local Meraki reps, so they can add your account to the FR, and also ping the API team internally. The combination of these things helps with the visibility and prioritization.
This API endpoint for DHCP settings should certainly come in time. Sorry I have no ETA for now. Remember that 2 years ago, there was no API to speak of, and now there are over 25 million calls/day against the Meraki API, partners and customers are now truly leveraging Meraki as a development platform, and new API endpoints are being developed all the time. This one too should just be a combination of time, demand and priority.