There is utility 'size' that is by default called automatically after build and its output is displayed in the console window like this:
"Invoking: Standard S32DS Print Size
arm-none-eabi-size --format=berkeley Mem_43_EXFLS_Example_S32K396.elf
text data bss dec hex filename
53868 4 12508 66380 1034c Mem_43_EXFLS_Example_S32K396.elf
Finished building: Mem_43_EXFLS_Example_S32K396.siz
12:36:51 Build Finished. 0 errors, 0 warnings. (took 28s.643ms)"
Description here:
https://sourceware.org/binutils/docs/binutils/size.html
It may be setup here:

Regarding sections and object within these section - you can see it in .map file (after build, in project target folder).