Filtering one collection using DBRef from a second one that refers to another third

Working with Data
,
8

Given that every sensorsData document includes dates:

{
	"_id": {"$oid":"5f1957c7cdf25116937ed3ef"},
	"idSensor": {"$numberLong":"3"},
	"idDevice":{"$numberLong":"48"},
	...
	"data":
	{
		"inicio":"2019-11-28T16:09:08+01:00",
		"fin":"2019-11-28T16:09:18+01:00",
		...
	},
	...
}

I’m trying to add them as filters to my original query, within the second $match:

[
...
	{
        "$match":
        {
            "$expr":
            {
                "$and": 
                [
                    {"array.idSensor": 3},
                    {"$gt": ["array.data.inicio", "ISODate('2021-02-28T23:59:59+01:00')"]},
                    {"$lt": ["array.data.fin", "ISODate('2021-03-15T00:00:01+01:00')"]}
                ]
            }
        }
    },
...
]

But I’m getting this error message:

“FieldPath field names may not contain ‘.’.”

What is it about?