Why is LIN protocol not included in the CMSIS drivers

Hi everyone, I'm currently working in the development of LIN communication protocol and it would be great if it were included in the CMSIS drivers but it does not.

How can I implement it? since using UART is not an option for my because my device has specific LIN hardware.

I would like it to be CMSIS compliant in order to reuse it later.

Any suggestions will be welcome.

Thank you

pd. I looked here: www.keil.com/.../index.html