To whitelist a source IP address from Web firewall, you need to allow traffic from the specific IP address and then ensure that reverse-proxy passes requests from that IP without applying WAF rules.
This feature is available with the Artica v4.50 Service Pack 1 or the v4.50 Hotfix 20240922-06
Here's a step-by-step guide to doing this
Web FireWall > Rules
Allow
.Rules
tabNew rule
button in order to create a new free rule.