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What you can do is use a Stay Awake routine.
The best you can do is prevent the screen from closing using a Stay Awake routine .
Either use a Stay Awake block routine using a Notifier
or you use Taifun’s Tools Extension: https://puravidaapps.com/tools.php
Be aware using either an extension or a block routine drains your device battery rapidly . These work around methods are not running the app in the Background, they force the app screen to stay open.