diff --git a/src/sentry/incidents/charts.py b/src/sentry/incidents/charts.py
index cf7df6e442e2..0207605929fa 100644
--- a/src/sentry/incidents/charts.py
+++ b/src/sentry/incidents/charts.py
@@ -30,6 +30,8 @@
 SESSION_AGGREGATE_TO_FIELD = {
     CRASH_FREE_SESSIONS: "sum(session)",
     CRASH_FREE_USERS: "count_unique(user)",
+    "percentage(sessions_crashed, sessions)": "sum(session)",
+    "percentage(users_crashed, users)": "count_unique(user)",
 }
 
 
diff --git a/static/app/views/alerts/utils/index.tsx b/static/app/views/alerts/utils/index.tsx
index 8d2217990dea..95195492b864 100644
--- a/static/app/views/alerts/utils/index.tsx
+++ b/static/app/views/alerts/utils/index.tsx
@@ -110,12 +110,18 @@ export function getQueryDatasource(
 }
 
 export function isSessionAggregate(aggregate: string) {
-  return Object.values(SessionsAggregate).includes(aggregate as SessionsAggregate);
+  return (
+    Object.values(SessionsAggregate).includes(aggregate as SessionsAggregate) ||
+    aggregate === 'percentage(sessions_crashed, sessions)' ||
+    aggregate === 'percentage(users_crashed, users)'
+  );
 }
 
 export const SESSION_AGGREGATE_TO_FIELD: Record<string, SessionFieldWithOperation> = {
   [SessionsAggregate.CRASH_FREE_SESSIONS]: SessionFieldWithOperation.SESSIONS,
   [SessionsAggregate.CRASH_FREE_USERS]: SessionFieldWithOperation.USERS,
+  'percentage(sessions_crashed, sessions)': SessionFieldWithOperation.SESSIONS,
+  'percentage(users_crashed, users)': SessionFieldWithOperation.USERS,
 };
 
 export function alertAxisFormatter(value: number, seriesName: string, aggregate: string) {