Hello @Unnikrishnankv,
I don't believe there is, but even if there were, I don't think it would be the best way to proceed.
If you want to do advanced pre-processing then I think your best bet is to do so during a build process, by creating a front-end project as is commonly done when using the later version of the AEM Maven Archetype. Here are some advantages:
- This is the direction that the AEM community is going, so you're more likely to be in line with best practices
- The documentation around npm, webpack, node, etc. is much vaster than the documentation on AEM compilers
- You will decouple your pre-processing from AEM, meaning that your website CSS can't be broken by a future AEM release
- You have complete control over every aspect of your build for LESS, JS, resources, etc.