@RiteshY18 Fastly as a CDN offers WAF rules as part of its Security Offerings. However, AEMaaCS provisioned Fastly does not come with WAF rules. AEMaaCS is currently provisioned with Fastly CDN in limited capacity.
I believe, Adobe team is working to release this limitation and enable Fastly WAF rules on AEMaaCS. This is in future roadmap, however a target date cannot be suggested.