RTX with CMSIS RTOS : dynamically create MUTEX

hi

i'm searching how to dynamically create mutex in CMSIS-RTOS/KEIL.

i saw the osMutexCreate only accept const osMutexDef_t *

do you know how i can manage to create a mutex, runtime and dynamically allocated in memory please ?

i'm porting a code where there is Mutex_Create(); everywhere so i didn't found other possibilities, yet.

thank you

best regards
KArl