title: ECharts Nested (directed) Graph
body: <p>When thinking on the visual expression for a workflow, a directed-graph may be one of the first solutions that comes to mind.</p>
  <p>My app already leverage ECharts so I'd like to use it as well to generate a graph for my workflow.</p>
  <p>Following is a basic example of a nested-directed-workflow:
  <a href="https://i.stack.imgur.com/VpH3l.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VpH3l.png" alt="State machine example with nested child machines" /></a></p>
  <p>Is there any component in ECharts that can be used as a container? and be linked to/from (similar to the <code>red</code> &quot;container&quot; in the above image?</p>
  <p>UPDATE: <a href="https://github.com/apache/incubator-echarts/issues/13033" rel="nofollow noreferrer">created an issue</a> on ECharts Github repo to help drive this forward.
  Linking between two ECharts Series should be useful for this use-case as well.</p>