Mike Bostock's notebook here is a great starting point, showing how to import and use mapd-connector [1] in an Observable notebook and then feed its data into a vega-lite chart:
This is a good point. There are lots of interesting possibilities with Observable, especially using the OmniSciDB open-source project for analyses that people intentionally do want to share
https://observablehq.com/@mbostock/hello-mapd-connector
[1]: The Javascript client for connecting to OmniSci, https://github.com/omnisci/mapd-connector