ARM: Adding HAL functions to the PACK in project for STM32L496

Hello, my project was created for blinking project with STM32L496QG using PACK. The set of Device HAL functions is limited. How I can add more HAL functions e.g. for SPI and UART? they are present in the folder Keil\ARM\PACK\Keil\STM32L4xx_DFP\2.2.0\. Thanks, Alex