Graph filter by custom field


I’ve been looking into Ralph for some time, We need to utilize custom fields to use in graphs filtering.

Are we able to filter custom fields ?

Please refer to my current code in graphs and i wanted to add custom fields inside the filter.

    "filters": {
        "location": "Unix",
        "model__category__name": "Laptop"
    "labels": "location",
    "series": "location"

Thanks In advance for Help!