How to set a topic fx_list through MQTT discovery?

Development
1

I use hass_discover["fx_list"] = "[\"one\", \"two\", \"three\"]" in Arduino IDE, but RGB lamp show all effects as one line, no list. How to correct setup effect_list topic through MQTT discovery?

2

I solved, I need to use the Magic Format

const char effect_list = R”=====( … “effect” data… )=====”;

after serialization