How to visualize nested fileds in Kibana

Elastic Stack Kibana
1

Hello guys, I'm a newbie to Kibana.
I have the following index created in Elasticsearch which I need to visualize "pressure(value)" over "registrydate" in Kibana.(Line Chart)
How could it possible to do it in Kibana?

Thanks in advance!!

{
"_index": "process_data",
"_type": "_doc",
"_id": "UzFHVDM1MTAxMTk5QSAyMDAyMDAwOTUzN19TVDNBMjBfU1QzQTIwMTAwXzIwMjAtMDItMThUMTk6NDc6MzM=",
"_version": 1,
"_score": 1,
"_source": {
"eid": "",
"line": "Line 1",
"equipment": "Equipment 1",
"ladderver": "",
"registrydate": "2020-02-18T19:47:33",
"registryutcdate": "2020-02-18T10:47:33",
"setupid": "",
"workid": "2345743",
"datas": [
{
"datas_id": "001",
"name": "cycletime",
"value": "13.9"
}
,
{
"datas_id": "002",
"name": "machinetime",
"value": "10.7"
}
,
{
"datas_id": "003",
"name": "pressure",
"value": "12.56"
}
]
}
}
2

You will have to flatten the data in Elasticsearch in order to achieve this as Kibana doesn't support nested fields completely.