diff --git a/api/v1/config.go b/api/v1/config.go
index 31e9eed..affbe52 100644
--- a/api/v1/config.go
+++ b/api/v1/config.go
@@ -215,6 +215,8 @@ type NotificationIntegrationWebhookSpec struct {
 	BasicAuth *BasicAuthSpec `json:"basicAuth,omitempty"`
 	// Custom headers to include in requests.
 	CustomHeaders []HeaderSpec `json:"customHeaders,omitempty"`
+	// Static key-value pairs included as top-level fields in template data.
+	CustomFields map[string]string `json:"customFields,omitempty"`
 	// Notify of incidents (SLO violation).
 	Incidents bool `json:"incidents,omitempty"`
 	// Notify of deployments.
diff --git a/api/v1/zz_generated.deepcopy.go b/api/v1/zz_generated.deepcopy.go
index 45ae62b..b7c2696 100644
--- a/api/v1/zz_generated.deepcopy.go
+++ b/api/v1/zz_generated.deepcopy.go
@@ -1427,6 +1427,13 @@ func (in *NotificationIntegrationWebhookSpec) DeepCopyInto(out *NotificationInte
 		*out = make([]HeaderSpec, len(*in))
 		copy(*out, *in)
 	}
+	if in.CustomFields != nil {
+		in, out := &in.CustomFields, &out.CustomFields
+		*out = make(map[string]string, len(*in))
+		for key, val := range *in {
+			(*out)[key] = val
+		}
+	}
 	if in.Alerts != nil {
 		in, out := &in.Alerts, &out.Alerts
 		*out = new(bool)
diff --git a/config/crd/coroot.com_coroots.yaml b/config/crd/coroot.com_coroots.yaml
index 2754da3..b8aa6ac 100644
--- a/config/crd/coroot.com_coroots.yaml
+++ b/config/crd/coroot.com_coroots.yaml
@@ -7108,6 +7108,12 @@ spec:
                                 username:
                                   type: string
                               type: object
+                            customFields:
+                              additionalProperties:
+                                type: string
+                              description: Static key-value pairs included as top-level
+                                fields in template data.
+                              type: object
                             customHeaders:
                               description: Custom headers to include in requests.
                               items:
diff --git a/config/crd/coroot.com_coroots_legacy.yaml b/config/crd/coroot.com_coroots_legacy.yaml
index 055542e..3135725 100644
--- a/config/crd/coroot.com_coroots_legacy.yaml
+++ b/config/crd/coroot.com_coroots_legacy.yaml
@@ -6426,6 +6426,11 @@ spec:
                                   username:
                                     type: string
                                 type: object
+                              customFields:
+                                additionalProperties:
+                                  type: string
+                                description: Static key-value pairs included as top-level fields in template data.
+                                type: object
                               customHeaders:
                                 description: Custom headers to include in requests.
                                 items: