Medical app notifications must stay LOUD

I normally keep my OnePlus 13 slider on the "Vibrate" setting as to not disturb others. Sometimes in the evening, I switch it to the "Ring" (loud) setting. I recently installed an app for a medical device, and I require the app to be loud at all times. I tried enabling "Allow in Do Not Disturb" but this only takes effect when using Do Not Disturb, which stops all other notifications. How can I set my medical app (or any app) to be loud AT ALL TIMES, while keeping all other apps on Silent, Vibrate, Ring (according to the slider)?