kotlinx-coroutines-sl4j lacks example how to update MDC withing coroutines

[Szer]

This page mentions that there is a way to update MDC within coroutine so updated values would propagate back to the parent context's MDC, but it lacks real code example how to achieve that.

The only phrase (which could be treated as vague by some groups of people) is that one:
Use withContext(MDCContext()) { ... } to capture updated map of MDC keys and values for the specified block of code.

My proposal would be to provide such an example (I have to find one yet!)