Monitor buffer size of Kotlin Flow

I have a complex chain of operators on a Kotlin Flow, and many of them are ran in groups in different contexts using flowOn like this:

flowOf(1, 2, 3)
    .map { /*do some stuff*/ }
    .flowOn(context1)
    .map { /*do some different stuff*/ }
    .flowOn(context2)

According to documentation, each flowOn introduces a channel buffer with default size 64 (configurable).

In addition to this, I have a MutableSharedFlow with a fixed buffer size configured by the extraBufferCapacity parameter to which I'm emitting items.

I would like to monitor the current buffer sizes, however, the buffers are private property and there seems to be no method to retrieve the buffer reference or its current size. Is there any way to retrieve it, or is it intended solely for internal Flow purposes?