Hello @Sahil_coder ,
You should check Magento\SalesRule\Model\Validator:: process method. In which you will get an idea about it.
--If my answer is useful, please Accept as Solution & give Kudos
@gelanivishal yes i will check and try then let you know
There is already a full fledged free extension available on magento's marketplace and github
magento: https://marketplace.magento.com/ambab-module-couponlist.html
github: https://github.com/ambab-infotech/couponlist
This might help someone and this does provide APIs to just list of applicable coupon for specify cart.
