Hi Chaitanya,
You can have a look at custom runtime settings documentation(https://docs.mendix.com/refguide/custom-settings/) and also custom domains documentation(https://docs.mendix.com/developerportal/deploy/custom-domains/).
However, it would not help unless you get a Licensed Mendix Cloud. You can refer to this documentation on the limitations of a Free Mendix Cloud App: https://docs.mendix.com/developerportal/deploy/mendix-cloud-deploy/
Regards
Kevin