I am trying to make a step-after graph in vega-lite like this example https://vega.github.io/vega-lite/examples/line_step.html. It has values on discrete dates. I want to extend the graph so the last step goes all the way to today´s date (making it an actual step and not just a vertical line at the last date in the data).
I tried but failed to find a way to add a calculated extra row to the data i.e.: {date:<today´s date>, value:<last_value>}
Any ideas?