feat(Google Gemini Chat Model Node): Add support for new Google Gemini models (#9130)

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Michael Kret <michael.k@radency.com>

packages/@n8n/nodes-langchain/nodes/chains/ChainLLM/ChainLlm.node.ts

@@ -21,6 +21,7 @@ import { CombiningOutputParser } from 'langchain/output_parsers';
 import { LLMChain } from 'langchain/chains';
 import type { BaseChatModel } from '@langchain/core/language_models/chat_models';
 import { HumanMessage } from '@langchain/core/messages';
+import { ChatGoogleGenerativeAI } from '@langchain/google-genai';
 import { getTemplateNoticeField } from '../../../utils/sharedFields';
 import {
 	getOptionalOutputParsers,
@@ -74,14 +75,19 @@ async function getImageMessage(
 	}
 
 	const bufferData = await context.helpers.getBinaryDataBuffer(itemIndex, binaryDataKey);
+	const model = (await context.getInputConnectionData(
+		NodeConnectionType.AiLanguageModel,
+		0,
+	)) as BaseLanguageModel;
+	const dataURI = `data:image/jpeg;base64,${bufferData.toString('base64')}`;
+
+	const imageUrl = model instanceof ChatGoogleGenerativeAI ? dataURI : { url: dataURI, detail };
+
 	return new HumanMessage({
 		content: [
 			{
 				type: 'image_url',
-				image_url: {
-					url: `data:image/jpeg;base64,${bufferData.toString('base64')}`,
-					detail,
-				},
+				image_url: imageUrl,
 			},
 		],
 	});