diff --git a/common/utils.ts b/common/utils.ts
index dc5b780f..6c2e29a7 100644
--- a/common/utils.ts
+++ b/common/utils.ts
@@ -36,7 +36,7 @@ export function getCharacterLimitedString(
     : '';
 }
 
-export function customStringify(jsonObj: {}): string {
+export function customStringify(jsonObj: {} | []): string {
   return JSON.stringify(jsonObj, undefined, 2);
 }
 
diff --git a/public/pages/workflow_detail/workflow_inputs/processor_inputs/input_transform_modal.tsx b/public/pages/workflow_detail/workflow_inputs/processor_inputs/input_transform_modal.tsx
index 574f951b..5e43ea37 100644
--- a/public/pages/workflow_detail/workflow_inputs/processor_inputs/input_transform_modal.tsx
+++ b/public/pages/workflow_detail/workflow_inputs/processor_inputs/input_transform_modal.tsx
@@ -97,8 +97,12 @@ export function InputTransformModal(props: InputTransformModalProps) {
   const [sourceInput, setSourceInput] = useState<string>('[]');
   const [transformedInput, setTransformedInput] = useState<string>('{}');
 
-  // get the current input map
+  // get some current form values
   const map = getIn(values, props.inputMapFieldPath) as MapArrayFormValue;
+  const oneToOne = getIn(
+    values,
+    `${props.baseConfigPath}.${props.config.id}.one_to_one`
+  );
 
   // selected transform state
   const transformOptions = map.map((_, idx) => ({
@@ -310,7 +314,11 @@ export function InputTransformModal(props: InputTransformModalProps) {
                             (hit: SearchHit) => hit._source
                           );
                           if (hits.length > 0) {
-                            setSourceInput(customStringify(hits[0]));
+                            setSourceInput(
+                              // if one-to-one, treat the source input as a single retrieved document
+                              // else, treat it as all of the returned documents
+                              customStringify(oneToOne ? hits[0] : hits)
+                            );
                           }
                         })
                         .catch((error: any) => {
diff --git a/public/pages/workflow_detail/workflow_inputs/processor_inputs/output_transform_modal.tsx b/public/pages/workflow_detail/workflow_inputs/processor_inputs/output_transform_modal.tsx
index 11b9d922..01a4ce93 100644
--- a/public/pages/workflow_detail/workflow_inputs/processor_inputs/output_transform_modal.tsx
+++ b/public/pages/workflow_detail/workflow_inputs/processor_inputs/output_transform_modal.tsx
@@ -86,7 +86,7 @@ export function OutputTransformModal(props: OutputTransformModalProps) {
   const [sourceOutput, setSourceOutput] = useState<string>('[]');
   const [transformedOutput, setTransformedOutput] = useState<string>('{}');
 
-  // get some current values
+  // get some current form values
   const map = getIn(values, props.outputMapFieldPath) as MapArrayFormValue;
   const fullResponsePath = getIn(
     values,
diff --git a/public/utils/utils.ts b/public/utils/utils.ts
index d6ce3d22..2b607afb 100644
--- a/public/utils/utils.ts
+++ b/public/utils/utils.ts
@@ -24,6 +24,7 @@ import {
 import { getCore, getDataSourceEnabled } from '../services';
 import {
   MDSQueryParams,
+  MapEntry,
   ModelInputMap,
   ModelOutputMap,
 } from '../../common/interfaces';
@@ -177,19 +178,17 @@ export function unwrapTransformedDocs(
 
 // ML inference processors will use standard dot notation or JSONPath depending on the input.
 // We follow the same logic here to generate consistent results.
-export function generateTransform(input: {}, map: MapFormValue): {} {
+// Collapse the values depending on if the input is an array or not.
+export function generateTransform(input: {} | [], map: MapFormValue): {} | [] {
   let output = {};
   map.forEach((mapEntry) => {
     const path = mapEntry.value;
     try {
-      let transformedResult = undefined;
-      if (mapEntry.value.startsWith(JSONPATH_ROOT_SELECTOR)) {
-        // JSONPath transform
-        transformedResult = jsonpath.query(input, path);
-        // Standard dot notation
-      } else {
-        transformedResult = get(input, path);
-      }
+      const transformedResult = Array.isArray(input)
+        ? input.map((inputEntry) =>
+            getTransformedResult(mapEntry, inputEntry, path)
+          )
+        : getTransformedResult(mapEntry, input, path);
       output = {
         ...output,
         [mapEntry.key]: transformedResult || '',
@@ -199,6 +198,18 @@ export function generateTransform(input: {}, map: MapFormValue): {} {
   return output;
 }
 
+function getTransformedResult(
+  mapEntry: MapEntry,
+  input: {},
+  path: string
+): any {
+  return mapEntry.value.startsWith(JSONPATH_ROOT_SELECTOR)
+    ? // JSONPath transform
+      jsonpath.query(input, path)
+    : // Standard dot notation
+      get(input, path);
+}
+
 // Derive the collection of model inputs from the model interface JSONSchema into a form-ready list
 export function parseModelInputs(
   modelInterface: ModelInterface | undefined