diff --git a/packages/zeebe-element-templates-json-schema/src/defs/properties.json b/packages/zeebe-element-templates-json-schema/src/defs/properties.json
index 896f0e8..6f140a2 100644
--- a/packages/zeebe-element-templates-json-schema/src/defs/properties.json
+++ b/packages/zeebe-element-templates-json-schema/src/defs/properties.json
@@ -277,7 +277,19 @@
         "then": {
           "properties": {
             "value": {
-              "type": "string"
+              "oneOf": [
+                {
+                  "type": "string",
+                  "pattern": "^="
+                },
+                {
+                  "type": "string",
+                  "not": {
+                    "pattern": "^="
+                  },
+                  "deprecated": true
+                }
+              ]
             }
           }
         }
diff --git a/packages/zeebe-element-templates-json-schema/test/fixtures/feel-value-mismatch.js b/packages/zeebe-element-templates-json-schema/test/fixtures/feel-value-mismatch.js
index 191ed5f..241fe4c 100644
--- a/packages/zeebe-element-templates-json-schema/test/fixtures/feel-value-mismatch.js
+++ b/packages/zeebe-element-templates-json-schema/test/fixtures/feel-value-mismatch.js
@@ -39,10 +39,37 @@ export const errors = [
   {
     keyword: 'type',
     dataPath: '/properties/1/value',
-    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/type',
-    params: { type: 'string' },
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/oneOf/0/type',
+    params: {
+      type: 'string'
+    },
+    message: 'should be string'
+  },
+  {
+    keyword: 'type',
+    dataPath: '/properties/1/value',
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/oneOf/1/type',
+    params: {
+      type: 'string'
+    },
     message: 'should be string'
   },
+  {
+    keyword: 'not',
+    dataPath: '/properties/1/value',
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/oneOf/1/not',
+    params: {},
+    message: 'should NOT be valid'
+  },
+  {
+    keyword: 'oneOf',
+    dataPath: '/properties/1/value',
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/oneOf',
+    params: {
+      passingSchemas: null
+    },
+    message: 'should match exactly one schema in oneOf'
+  },
   {
     keyword: 'if',
     dataPath: '/properties/1',
@@ -53,10 +80,37 @@ export const errors = [
   {
     keyword: 'type',
     dataPath: '/properties/2/value',
-    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/type',
-    params: { type: 'string' },
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/oneOf/0/type',
+    params: {
+      type: 'string'
+    },
+    message: 'should be string'
+  },
+  {
+    keyword: 'type',
+    dataPath: '/properties/2/value',
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/oneOf/1/type',
+    params: {
+      type: 'string'
+    },
     message: 'should be string'
   },
+  {
+    keyword: 'not',
+    dataPath: '/properties/2/value',
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/oneOf/1/not',
+    params: {},
+    message: 'should NOT be valid'
+  },
+  {
+    keyword: 'oneOf',
+    dataPath: '/properties/2/value',
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/oneOf',
+    params: {
+      passingSchemas: null
+    },
+    message: 'should match exactly one schema in oneOf'
+  },
   {
     keyword: 'if',
     dataPath: '/properties/2',