Not sure if this has been resolved or not, but I also experience this
issue; I have a workaround though! For a bar chart specifically; I
create a new freeform table with the metric to be charted in the "left"
of the table. I place the items (products or services in my world) at
the "top" of the freeform table. I then insert the bar chart visual,
making sure the data source is referencing the new table. You can then
choose to "Lock Selection" on an active field in the table, as well as