add additional systemMessagePrompt into CSV Agent

packages/components/nodes/agents/CSVAgent/CSVAgent.ts

@@ -37,6 +37,16 @@ class CSV_Agents implements INode {
                 label: 'Language Model',
                 name: 'model',
                 type: 'BaseLanguageModel'
+            },
+            {
+                label: 'System Message',
+                name: 'systemMessagePrompt',
+                type: 'string',
+                rows: 4,
+                additionalParams: true,
+                optional: true,
+                placeholder:
+                    'I want you to act as a document that I am having a conversation with. Your name is "AI Assistant". You will provide me with answers from the given info. If the answer is not included, say exactly "Hmm, I am not sure." and stop after that. Refuse to answer any question not about the info. Never break character.'
             }
         ]
     }
@@ -49,6 +59,7 @@ class CSV_Agents implements INode {
     async run(nodeData: INodeData, input: string, options: ICommonObject): Promise<string> {
         const csvFileBase64 = nodeData.inputs?.csvFile as string
         const model = nodeData.inputs?.model as BaseLanguageModel
+        const systemMessagePrompt = nodeData.inputs?.systemMessagePrompt as string
 
         const loggerHandler = new ConsoleCallbackHandler(options.logger)
         const handler = new CustomChainHandler(options.socketIO, options.socketIOClientId)
@@ -127,7 +138,9 @@ json.dumps(my_dict)`
         if (finalResult) {
             const chain = new LLMChain({
                 llm: model,
-                prompt: PromptTemplate.fromTemplate(finalSystemPrompt),
+                prompt: PromptTemplate.fromTemplate(
+                    systemMessagePrompt ? `${systemMessagePrompt}\n${finalSystemPrompt}` : finalSystemPrompt
+                ),
                 verbose: process.env.DEBUG === 'true' ? true : false
             })
             const inputs = {