Not exactly sure what you are looking for but, fwiw, I have written a test library that times tests and reports tests over a threshold. Up till now it has been used only in JVM projects. Now I am switching many (all) of my active libraries to KMP. Using IntelliJ I see no issues. Using Fleet I see an issue in that the test library uses JUnit4 where the using libraries use JUnit 5 so Fleet complains. I am inclined to lose the library and figure out a JUnit 5 only solution but have not done so yet.
You can see examples on GitLab:
test library and
a using library