nRF5340 TX Power configuration in Zephyr based projects

I tried a few demos for the nRF5340-DK and most of them work fine. What's unclear to me is where the TX Power is configured or what the default TX Power is in the Zephyr based examples.

There is an HCI Power Control example, but I couldnt make it run properly yet. It's unclear to me if I have to edit the application configuration and/or the child-image configuration to make the example work.

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