Hi,
you can try to define your own memory region in liker command file and mark it as read only. And in your code use a #pragma directive to place your read only data there.
A #pragma is a compiler directive. After you have set the pragma to the desired state, all code after that point is compiled with that setting until either you change the setting or reach the end of the file. At the beginning of each file, the compiler reverts to the project or default settings.
best regards - Adam