Retrieve impressions of a post that was made via my Facebook App

Question

There is a way to get the impressions insights of a post throught the graph api? I use my app to publish photos in the users profiles with then permission but i dont get any impressions of that post just likes, comments, reactions... I use the metric parameters from the App Insights documentation but this is what i get in all the cases:

{
"data": [
    {
        "time": "2017-08-15T08:00:00+0000",
        "value": "0"
    },
    {
        "time": "2017-08-16T08:00:00+0000",
        "value": "0"
    },
    {
        "time": "2017-08-17T08:00:00+0000",
        "value": "0"
    },
    {
        "time": "2017-08-18T08:00:00+0000",
        "value": "0"
    },
    {
        "time": "2017-08-19T08:00:00+0000",
        "value": "0"
    },
    {
        "time": "2017-08-20T08:00:00+0000",
        "value": "0"
    },
    {
        "time": "2017-08-21T08:00:00+0000",
        "value": "0"
    }
]

}

I log in different test users accounts and see this specific post, create comments and put likes but there is no impressions... Can somebody help me with this problem? Thanks!