Unused visualizations

I want to remove all visualizations that are not used on dashboards.
How can I get a list of all such visualizations through api or in some other way?

Used visualization has dashboard parent:

Unused visualization has no dashboard parent:

So far I've found this ways

Method №1

Method №2

  • Export saved object of type "dashboard" with related object
  • Delete all visualizations
  • Import saved object back (ndjson file)

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