diff --git a/kleros-sdk/src/dataMappings/utils/lambdas.ts b/kleros-sdk/src/dataMappings/utils/lambdas.ts
new file mode 100644
index 000000000..af6a44b5b
--- /dev/null
+++ b/kleros-sdk/src/dataMappings/utils/lambdas.ts
@@ -0,0 +1,13 @@
+export const lambdas = {
+  // Converts a value to hex representation
+  hex: function () {
+    return function (text: string, render: (value: string) => string) {
+      const originalValueStr = render(text);
+      const num = parseInt(originalValueStr, 10);
+      if (!isNaN(num)) {
+        return "0x" + num.toString(16).toLowerCase();
+      }
+      return originalValueStr;
+    };
+  },
+};
diff --git a/kleros-sdk/src/dataMappings/utils/populateTemplate.ts b/kleros-sdk/src/dataMappings/utils/populateTemplate.ts
index 68ae983ec..dc8ff8186 100644
--- a/kleros-sdk/src/dataMappings/utils/populateTemplate.ts
+++ b/kleros-sdk/src/dataMappings/utils/populateTemplate.ts
@@ -1,9 +1,10 @@
 import mustache from "mustache";
 import { DisputeDetails } from "./disputeDetailsTypes";
 import DisputeDetailsSchema, { RefuseToArbitrateAnswer } from "./disputeDetailsSchema";
+import { lambdas } from "./lambdas";
 
 export const populateTemplate = (mustacheTemplate: string, data: any): DisputeDetails => {
-  const render = mustache.render(mustacheTemplate, data);
+  const render = mustache.render(mustacheTemplate, { ...lambdas, ...data });
   const dispute = JSON.parse(render);
 
   const validation = DisputeDetailsSchema.safeParse(dispute);