adding "dimensions" to a chart metric

[svec7186]

i have splunk 7.3.1.  i have a dashboard with a col chart that displays _time and metric_value

i want to add additions data that gets displayed but is not relevant to metric_value or _time

1) when publishing the event attributes do i use the key "dimensions" and add an arbitrary dictionary?

2) will "dimensions" values be displayed in the col chart toolbar?