I have some GeoJSON data (originally GPX data) like below:

```
{"type": "FeatureCollection","features": [
{"type": "Feature","properties":{"time":"2018-03-15T12:22:17.293Z","provider":"network","time_long":"1521116537293","accuracy":"21.507","altitude":"521.2000122070313"},"geometry":{"type":"Point","coordinates":[12.9734916,13.6980481]}}
,{"type": "Feature","properties":{"time":"2018-03-15T12:20:50.000Z","provider":"gps","time_long":"1521116450000","accuracy":"26.0","altitude":"601.0","bearing":"306.1","speed":"0.95"},"geometry":{"type":"Point","coordinates":[12.9732416,13.69785612]}}
}

```

I need to add two global level parameters:

```
start_time: 1521116537293
filename:  myfile.jpg

```

So that when I perform WFS calls in Javascript, I get two parameters from GeoJSON response in addition to above GPX point data.

Is it possible and supported in GeoJSON and if so how to do that in QGIS?