Voice input from standby mode

nice to meet you.

I have an app that I am planning myself.
Recording with voice input from Android/iPhone standby mode,
We are trying to realize a function that separates processing depending on keywords.

I heard that it is difficult to do it directly with App Inventor 2.
Is there a way to achieve this using a plugin or something?

Please elaborate your information more that will help me to help you for what you want to achieve.

Sounds like you might be wanting to run your app in the background. See here for someone trying to do similar:

Thank you for your reply.
Please allow me to post additional information later again as it is late.