Filter for charts that are not added to any dashboard

What is the problem or goal the end user is trying to solve or accomplish?

Admins need to identify charts that aren't being used by any dashboard for proper content management.

How are they solving it currently?

It's only possible to perform this type of search through the API, and it can take a few different steps depending on the amount of created charts.

What is the recommended solution by the Customer?

Provide a way to filter for charts that are not added to any dashboard though the UI.