How to merge test report of elixir umbrella app?

We have an elixir umbrella app with 2 child apps. Currently we get 2 test reports as there are 2 child apps. Is there a way to merge the results into one?

Current report:

Finished in 1.4 seconds
5 tests, 0 failures, 1 excluded
Finished in 0.5 seconds
2 tests, 0 failures

Expected report:

Finished in 1.9 seconds
7 tests, 0 failures, 1 excluded