Maximum power requirement of Nano 33 series

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chibiconsulting: Where can I find the maximum power requirement for each of the radio equipped Nano 33 boards?

There is an often-used acronym RTFM. :) Well its actually the datasheets. You can find them on the website of the manufacturer of the individual devices. Some of them are available in the Arduino Store under TECH SPECS

https://store.arduino.cc/arduino-nano-33-iot

In most datasheets from good semiconductor companies you will find a section called Electrical Specification. They often start with maximum ratings and more detailed values for all kinds of use cases later.

Once you have read a few datasheets you will find the information you need quite quickly.