Access instance_name mqtt param in gcode macro?

[contagon]

Hey y'all, I'm trying to make a little gcode macro that'll set up Home Assistant auto mqtt discovery for me, and had a quick question. From the docs, I found this example:

[gcode_macro PUBLISH_ALERT]
gcode:
  {% set data = params.PAYLOAD|default(None) %}
  {action_call_remote_method("publish_mqtt_topic",
                             topic="klipper/alert",
                             payload=data,
                             qos=0,
                             retain=False,
                             use_prefix=True)}

where the use_prefix command is defined as:

use_prefix: When set to True the configured instance_name will be prefixed to the topic. For example, if the instance_name is my_printer and the topic is klipper/alert the published topic will be my_printer/klipper/alert. The default is False.

Does anyone know if there's a way to manually access the instance_name parameter? I'd like to be able to send to a topic along the lines of homeassistant/{instance_name}/klipper. Thanks for any help!