Task: Send a message to Telegram on a new item saved to Reader

n8n workflow:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[340,380],"parameters":{},"typeVersion":1},{"name":"Write Binary File","type":"n8n-nodes-base.writeBinaryFile","position":[1680,280],"parameters":{"fileName":"={{$node[\"Config\"].parameter[\"values\"][\"string\"][0][\"value\"]}}"},"typeVersion":1},{"name":"Read Binary File","type":"n8n-nodes-base.readBinaryFile","position":[580,460],"parameters":{"filePath":"={{$node[\"Config\"].parameter[\"values\"][\"string\"][0][\"value\"]}}"},"typeVersion":1,"continueOnFail":true,"alwaysOutputData":true},{"name":"HTTP Request","type":"n8n-nodes-base.httpRequest","position":[1020,460],"parameters":{"url":"https://readwise.io/reader/api/state/","options":{},"authentication":"headerAuth","queryParametersUi":{"parameter":[{"name":"schemaVersion","value":"5"},{"name":"filter[updated_at][gt]","value":"={{$json[\"last_synced\"]}}"}]},"headerParametersUi":{"parameter":[]}},"credentials":{"httpHeaderAuth":{"id":"10","name":"Header Auth account"}},"typeVersion":1},{"name":"Telegram","type":"n8n-nodes-base.telegram","position":[1480,460],"parameters":{"text":"={{$json[\"title\"]}} by {{$json[\"author\"]}}\n\n{{$json[\"summary\"]}}\n\n{{$json[\"url\"]}}","chatId":"={{$node[\"Config\"].parameter[\"values\"][\"number\"][0][\"value\"]}}","additionalFields":{}},"credentials":{"telegramApi":{"id":"2","name":"my bot"}},"typeVersion":1},{"name":"Binary to json","type":"n8n-nodes-base.moveBinaryData","position":[800,460],"parameters":{"options":{}},"typeVersion":1,"alwaysOutputData":true},{"name":"Json to binary","type":"n8n-nodes-base.moveBinaryData","position":[1480,280],"parameters":{"mode":"jsonToBinary","options":{}},"typeVersion":1},{"name":"Set new update time","type":"n8n-nodes-base.functionItem","position":[1280,280],"parameters":{"functionCode":"return {\n  last_synced: new Date().getTime()\n};"},"typeVersion":1},{"name":"Split into baches","type":"n8n-nodes-base.function","position":[1280,460],"parameters":{"functionCode":"const newValue = Object.values(items[0].json.documents).filter(it => it.category === 'article').filter(it => it.children.length === 0).map(it => ({\n  json: {\n      url: it.url,\n  title: it.title,\n  author: it.author,\n  summary: it.summary,\n  saved_at: new Date(it.saved_at),\n  }\n}))\n\n\nreturn newValue;"},"typeVersion":1},{"name":"Cron","type":"n8n-nodes-base.cron","position":[340,540],"parameters":{"triggerTimes":{"item":[{"mode":"everyX","unit":"minutes","value":10}]}},"typeVersion":1},{"name":"Config","type":"n8n-nodes-base.set","position":[800,300],"parameters":{"values":{"number":[{"name":"Telegram chat it","value":19999}],"string":[{"name":"file path","value":"/whatever/readwiseLastSynced.json"}]},"options":{}},"typeVersion":1}],"connections":{"Cron":{"main":[[{"node":"Read Binary File","type":"main","index":0}]]},"HTTP Request":{"main":[[{"node":"Split into baches","type":"main","index":0},{"node":"Set new update time","type":"main","index":0}]]},"Binary to json":{"main":[[{"node":"HTTP Request","type":"main","index":0}]]},"Json to binary":{"main":[[{"node":"Write Binary File","type":"main","index":0}]]},"Read Binary File":{"main":[[{"node":"Binary to json","type":"main","index":0}]]},"Split into baches":{"main":[[{"node":"Telegram","type":"main","index":0}]]},"Set new update time":{"main":[[{"node":"Json to binary","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Read Binary File","type":"main","index":0}]]}}}