It's not possible to do this, in the same way as the new alerting for Web app health (configured within MI). Uplink status change within Network-wide > Configure > Alerts is still the best tool in Dashboard itself. What I'd really recommend though, if you're looking for more granularity than simply Up/Down - and/or you're interested in WAN2 (and who isn't?) is looking at this fairly recent additional API call: 'Return the uplink loss and latency for every MX in the organization from 2 - 7 minutes ago'
Details are available under the Organizations heading within Help > API docs in Dashboard.