Implementation of SASS/SCSS using DXA in Tridion 8.5


I have a requirement of implementing CSS minify preocess using SASS/SCSS in tridion 8.5 DXA. Could any one please help me out with brief information with implementation steps. 

What are the different steps to be taken care or involved at CMS and TBB level.

Any input or suggestion are most welcome.

waiting for reply!!!