No trigger needed but I've found it helps guide FLUX and the LORA if you make your thing "metallic" or "chrome" or whatever else you can thing of that tells FLUX what you want changed based on the LORA's training, have a look at the examples that show the LORA on/off.

Weight: ? - 1 (recommended 1) https://civitai.com/models/531692?modelVersionId=772512