Hi brother trakker123,
I researched and I found the command to start a Microsoft Store App:
start shell:AppsFolder\PackageFamilyName!App
To find the PackageFamilyName of the application you can run the command below on PowerShell to write a file (in your Desktop folder) with all the information about all the Microsoft Apps installed and then open it.
get-appxpackage > $env:USERPROFILE\Desktop\apps.txt; notepad.exe $env:USERPROFILE\Desktop\apps.txt
Then you can search the PackageFamilyName with "ctrl+f" and entering the publisher name. In this case, the publisher of JW Library is the Watchtower Bible and Tract Society of New Yorkas you know. So you can type on the input "Watchtower".
Here you have the PackageFamilyName. Now you can create the task with your desired configuration. When you create the task, select the "cmd.exe" program on "C:\Windows\System32\cmd.exe". In parameters write the shown below:
/C "start shell:AppsFolder\PackageFamilyName!App"
In the case of JW Library will be:
/C "start shell:AppsFolder\WatchtowerBibleandTractSo.45909CDBADF3C_5rz59y55nfz3e!App"
I hope this helps you!
Best regards brother