How do we specify relationship between 2 entities in the JSON data file?

Hey waving from afar left In

charts

, you should have something like

inputs: []

where you can link their sources (database tables). In

dashboards,

I believe you have something like

charts: []

where you can define the

charts

that compose the dashboard. You also have

tags: []

,

owners: []

and so on. You can find more examples in https://datahubproject.io/docs/metadata-service Don't know if this was your doubt, but I hope this helps.