How to xTaskNotifyGive from my library for unblocking task in main.c?

How to xTaskNotifyGive from my library for unblocking task in main.c?
Maybe somehow with extern…?

Where is my_Taimers_TaskHandle defined. If it is defined as a global in main.c, you can add the following line in this file -

extern TaskHandle_t my_Taimers_TaskHandle;