Hi @Anton_K,
Unfortunately, our current BSP doesn't provide libjson-c-dev. JSON-C is the main library and libjson-c-dev provides the header files and static libraries that are necessary to build programs that use JSON-C.
In this case, you will need to compile this JSON-C library for your NXP platform, at the following link you will find more information on how to compile:
GitHub - json-c/json-c
Also, please look on the following thread of NXP Community:
Solved: unable to reference to cJSON.h or json-c.h librari... - NXP Community
Finally, if you can't find any other solution to add this library, you can use our Desktop Image for iMX.Here you can build an image and use the apt get for include this library such as Ubuntu.
GitHub - nxp-imx/meta-nxp-desktop: i.MX Yocto Project Desktop Layer
I hope this information will be helpful.
Have a great day!