I got this from their older version of the dashboard. 
dbdemos uc-04-system-tables
When everything is executed, go to your graph in the dashboard, click three dots in the top right, select in my case "View dataset:usage_overview" then paste/modify sql code as below. This will hardcode the workspace name into your dashboard.
 
-- parse workspaces json
workspace as (
  select explode(
    map_entries(from_json('{"2049501200185xyz":"namexyz","1944008075660xyz":"name2nyz","8293066424636xyz":"name3nyz"}', 'map<string,string>'))
  ) as kvp,
  kvp['key'] as workspace_id,
  kvp['value'] as workspace_name
),
-- apply date filter