Feature request

What problem does this feature solve?

The issue is that if I have multi HyperHDR server in my network connected to the same MQTT Server they will all share the same topic HyperHDR/JsonAPI, trigger an action will trigger all HyperHDR servers

More FR tho it's not so important, It will be even more useful I can specify the instance index through the topic,
HyperHDR/0/JsonAPI # Instance 0
HyperHDR/1/JsonAPI # Instance 1

What does the proposed API look like?

How should this be implemented in your opinion?

Add a textbox in MQTT Config tab to modify main topic

{var_mqtt_topic}/JsonAPI 
{var_mqtt_topic}/JsonAPI/response

Are you willing to work on this yourself?

Haven't code c++ before but I can help if needed