Remove text background in objectMeta-> textparams

how to remove object_meta->text_params.text_bg_clr in deepstream?
I have removed boundingbox and what types in osd but the background still hasn’t been removed.
object_meta->text_params.text_bg_clr.alpha=0;
with above line I hope background doesn’t appear but it is still on display.

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU)
• DeepStream Version
• JetPack Version (valid for Jetson only)
• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only)
• Issue Type( questions, new requirements, bugs)
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)