User Problem:

Currently it is not possible to just export a chart and then have it imported into a dashboard across different Analytics workspaces

Proposed solution:

Have the ability to export the chart (including single or multiple datasource type) and then have it imported into a dashboard across different Analytics workspaces

Workaround:

Export the dashboard that contains the chart in JSON and then import it to the required workspace. You can then copy/move the chart to the required dashboard. However, there is a limitation if using multiple datasource type as stated in ANALYTICS-379