RESTfull sensor: templating also for attributes

I am using restfull to iterate through a json file (see below) and the result for ‘state’ is fine.
However, I also want to add some other values in the attributes of the same, but I cannot find out how this works or… maybe this does not work at all? Can I set a value_template for the attributes in the same way?

 - name: 530_bus_outgoing
        value_template: >
             {% set y = value_json.entity | count %}
             {% for x in range(0,y) %}           
                {% set trip = value_json["entity"][x]["trip_update"]["trip"]["trip_id"] %}
                    {% if trip[:6] == "LR530A" %}
                        {% set y2 = value_json["entity"][x]["trip_update"]["stop_time_update"] | count %}
                        {% for x2 in range(0,y2) %}
                            {% set stop = value_json["entity"][x]["trip_update"]["stop_time_update"][x2]["stop_id"] %}
                                {% if stop == "STOPPOINT:00812" %}
                                    {{ as_local(as_datetime(value_json["entity"][x]["trip_update"]["stop_time_update"][x2]["departure"]["time"] + value_json["entity"][x]["trip_update"]["stop_time_update"][x2]["departure"]["delay"])) }}
                                {% endif %}    
                        {% endfor %}       
                    {% endif %}
             {% endfor %}