@nx/deno exclude lib from coverage

[pgg]

i have a nx workspace with a deno app in apps/ folder and a deno lib in libs folder. how do i exclude the libs from coverage when running tests in app? should the libs not be excluded by default since they should have their own tests? i tried specifying in deno.json of the app's test property "test": {"exclude": [""]} but no combination of paths to libs folder works for me?