Data Factory - Retrieve value from field with dash "-" from JSON file - json

Question

In my pipeline I reach through REST API using GET request to a 3rd party database. As an output I receive a bunch of JSON files. The number of JSON files I have to download (same as number of iterations I will have to use) is in one of the fields in JSON file. The problem is that the field's name is 'page-count' which contains "-".
#activity('Lookup1').output.firstRow.meta.page.page-count
Data Factory considers dash in field's name as a minus sign, so I get an error instead of value from that field.
{"code":"BadRequest","message":"ErrorCode=InvalidTemplate, ErrorMessage=Unable to parse expression 'activity('Lookup1').output.firstRow.meta.page.['page-count']'","target":"pipeline/Product_pull/runid/f615-4aa0-8fcb-5c0a144","details":null,"error":null}
This is how the structure of JSON file looks like:
"firstRow": {
"meta": {
"page": {
"number": 1,
"size": 1,
"page-count": 7300,
"record-count": 7300
},
"non-compliant-record-count": 7267
}
},
"effectiveIntegrationRuntime": "intergrationRuntimeTest1",
"billingReference": {
"activityType": "PipelineActivity",
"billableDuration": [
{
"meterType": "SelfhostedIR",
"duration": 0.016666666666666666,
"unit": "Hours"
}
]
},
"durationInQueue": {
"integrationRuntimeQueue": 1
}
}
How to solve this problem?

Answer 1

The below syntax works when retrieving the value for a json element with a hyphen. It is otherwise treated as a minus sign by the parser. It does not seem to be documented by Microsoft however I managed to get this to work through trial and error on a project of mine.
#activity('Lookup1').output.firstRow.meta.page['page-count']

Answer 2

This worked for us too. We had the same issue where we couldn't reference an output field that contained a dash(-). We referenced this post and used the square brackets and single quote and it worked!
Example below.
#activity('get_token').output.ADFWebActivityResponseHeaders['Set-Cookie']