filter on 'external assets' that appears in the UI due to Historical Materializations

[yamhirotoCS]

Hi,
We have a list of assets showing up in the UI as 'External Assets', with this really specific icon (a + within a circle). I understand these are assets that remain as part of historical materialization (the actual dbt asset has since been renamed or removed from the project).
Is there any tag or method to show all of them on the UI?

It could also be a programmatic approach (with the APi, Graphql), after loading the definitions, or within the RDS postgres (but I couldn't find any table nor fields that would allow me to retrieve all those external assets related to historical materializations) .

Many thanks !