Optional RETURN_NAMES to set the output name

server.py

@@ -152,6 +152,7 @@ class PromptServer():
                 info = {}
                 info['input'] = obj_class.INPUT_TYPES()
                 info['output'] = obj_class.RETURN_TYPES
+                info['output_name'] = obj_class.RETURN_NAMES if hasattr(obj_class, 'RETURN_NAMES') else info['output']
                 info['name'] = x #TODO
                 info['description'] = ''
                 info['category'] = 'sd'

web/scripts/app.js

@@ -611,8 +611,10 @@ class ComfyApp {
 						}
 					}
 
-					for (const output of nodeData["output"]) {
-						this.addOutput(output, output);
+					for (const o in nodeData["output"]) {
+						const output = nodeData["output"][o];
+						const outputName = nodeData["output_name"][o] || output;
+						this.addOutput(outputName, output);
 					}
 
 					const s = this.computeSize();