Task: Send a message to a Telegram channel

n8n workflow JSON:
{"id":"17","name":"telegram","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[490,260],"parameters":{},"typeVersion":1},{"name":"Telegram","type":"n8n-nodes-base.telegram","position":[680,260],"parameters":{"text":"test","chatId":"@n8ntest","additionalFields":{}},"credentials":{"telegramApi":"telegram-credential"},"typeVersion":1}],"active":false,"settings":{},"connections":{"On clicking 'execute'":{"main":[[{"node":"Telegram","type":"main","index":0}]]}}}