How to migrate Core UI Dashboards to Workspace Pages?

[Navaneeth1]

I have a custom-scoped application that I created several years ago, which is still used by my clients. I had made a dashboard for this application with a lot of reports using the Core UI. 
I started developing a workspace for my clients for this custom application, so that we can move to the new experience UI, and was wondering if there's a way to get my legacy Core UI Dashboard to show up on a workspace page?

I tried using the Migration Center to migrate the dashboard, and then tried to show it on a Dashboard template Page in UI Builder. However, when I keep my newly migrated dashboard as the default dashboard in the configurations, the output being shown is "Can't display this dashboard. The dashboard you were looking for was not found."

This dashboard does exist and I can see it from the Performance Analytics > Library > Dashboards list. Is there any way to configure a dashboard template page to show this old dashboard?

A new dashboard that I created in the Performance Analytics Experience does show up on this page with the relevant data though. 

Any documentation/help on this would be extremely helpful!
Thank you in advance!

[Ankur Bawiskar]

@Navaneeth1 

that's what I mentioned the old dashboard can't be rendered in Dashboards template page in UI builder

the link which talks about the workaround should help you but that's a hack

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