Is there a recommended way to reuse collections of JUnit 5 extensions?

Question

JUnit 5 seems to heavily recommend not using inheritance to share test logic and instead says to use Extensions.

So we're refactoring things into extensions.

Something I frequently see is a large number of tests programmatically adding the same three extensions. (All three of them are the kind of extension which has to be programmatically added due to their nature...)

I could implement a base class which adds these three extensions, but then I'm using inheritance again.

Is there a better way?

e.g., something like this would be nice:

public class AcmeTestExtension implements Extension {
    @RegisterExtension
    public final Extension1 extension1 = new Extension1();

    @RegisterExtension
    public final Extension2 extension1 = new Extension2();

    @RegisterExtension
    public final Extension3 extension1 = new Extension3();

    // can add methods here which delegate through to individual extensions
}

public class MyTest {
    @RegisterExtension
    public final AcmeTestExtension extension = new AcmeTestExtension();
}