Well, it’s nice that you can always define your own tagged template literal. ;) The double backslashes certainly are annoying. We may be able to eliminate them by using String.raw. https://github.com/observablehq/notebook-stdlib/issues/10
I just saw that pop up on the front page of observablehq. That resolves another pain point for me. (My first experiment with the platform happened to have a lot of math exposition in it.)