As far as i know there is only one component in ha that can render jinja templates in the call service parameters (can’t remember the name), in nodered you will have to generate the timestamp in a function node using the javascript Date methods or use the moment node to construct later the date using mustache template in the call service node
If you have seen examples of using double curly braces in examples or ss here for nodered is called mustache syntax. They can expand msg properties, global and flow context, and now ha entity states.
Here is a basic example.
[{"id":"ddd79a0f.cffcc8","type":"inject","z":"9ac58995.e96338","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":"0.3","x":320,"y":2020,"wires":[["760088ed.b1e2b8"]]},{"id":"760088ed.b1e2b8","type":"moment","z":"9ac58995.e96338","name":"","topic":"","input":"","inputType":"msg","inTz":"Australia/Brisbane","adjAmount":0,"adjType":"days","adjDir":"add","format":"object","locale":"en_AU","output":"d","outputType":"msg","outTz":"Australia/Brisbane","x":520,"y":2020,"wires":[["298cf35d.22c66c"]]},{"id":"298cf35d.22c66c","type":"api-call-service","z":"9ac58995.e96338","name":"","server":"d5ce5cec.92bc8","service_domain":"notify","service":"ha_telegram","data":"{\"message\":\"Arrived at {{d.hours}}:{{d.hours}}:{{d.minutes}}\"}","mergecontext":"","output_location":"","output_location_type":"none","x":750,"y":2020,"wires":[[]]},{"id":"d5ce5cec.92bc8","type":"server","z":"","name":"Home Assistant","legacy":false}]