def proba(request):
    all_statistics = Statistics.objects.all()
    limited_by_fields = all_statistics.values("user_id", "username", "total", "g_played", "per")
    for_context = {"stats": limited_by_fields}
    return render(request, "first_app/stat_table.html", for_context)

...
{% for stat in stats %}
        <tr>
            <td>{{ stat["user_id"] }}</td>
            <td>{{ stat["username"] }}</td>
            <td>{{ stat["total"] }}</td>
            <td>{{ stat["g_played"] }}</td>
            <td>{{ stat["per"] }}</td>
        </tr>
{% endfor %}
...