I have a Deneb visual in PowerBI, with vega-lite. I want to aggregate in a new column the text values from the data rows the user have selected (or all if no data row is selected).
For a better understanding of what I want to achieve, here is the data table in its primary state, with no data points selected:
| Key |
Value to concatenate |
Concatenation (new column) |
| A |
valueA |
valueA, valueB, valueC |
| B |
valueB |
valueA, valueB, valueC |
| C |
valueC |
valueA, valueB, valueC |
