Canvas Single Data Source

[insukcho]

Describe the feature:
Currently, Canvas has no way to put a single data source that can be accessed by each element. That makes big inefficiency for gathering all data from each element's query even duplicated.

Describe a specific use case for the feature:

1. Providing one additional element only for retrieving data with JSON format.

2. Then, providing one more additional data source to point to the above internal element to the below panel.

[insukcho]

any updates for this ER?

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[ThomThomson]

Closing this as adding shared data-sources to Canvas is a very large undertaking, and we currently are not prioritizing Canvas enhancements.