stop auto lock for specific app on iphone

I frequently use the iPhone Voice Memo app for my academic recordings. However, a recurring issue arises as my iPhone tends to power off while I am preparing materials for recording. Additionally, when I attempt to review my recordings, the need to navigate forward or backward becomes challenging due to the frequent auto-lock feature. Disabling auto-lock in the general settings poses its own set of challenges and is quite bothersome. While I have come across various apps that claim to prevent iPhone auto-lock, I am still searching for a definitive solution to this problem. Is there no resolution available? All available third party apps on market almost have the same problem