<Ralph[m]> "thanks! i just saw that the..." <- A few years ago I implemented data transfer between a calliope mini (which is essentially a micro:bit with a different form factor, using mostly the same software) and an nrf24l01 module.
As the nrf24l01 doesn't implement the protocol spoken by the micro:bit, but uses a compatible radio modulation scheme, it's only used to get a raw bit stream. All the en/decoding is done manually. And even that only took a few 100 lines of rust code.
I guess implementing the same on a micro:bit is even easier, as the hardware probably handles some of the en/decoding steps.
I don't remember the details, and I only did it out of curiosity and not with the goal of writing quality software. So please don't expect much. That said, the code I wrote is available at https://github.com/jannic/calliope-nrf24, in case you are interested.