Running a blocking task in the background from a bash script

Question

I want to create a shell script that runs the blocking Gradle task ./gradlew runIdeForUiTests in the background.

From the terminal, this could be accomplished by running ./gradlew runIdeForUiTests &, but when I put this line in a shell script and run the shellscript without an ampersand from the terminal, it doesn't run in the background.

I've tried https://stackoverflow.com/a/48620810/10175681 but nohup doesn't seem to run in the background (you have to press Ctrl+C to terminate the program). It's the same for this answer: https://stackoverflow.com/a/49834743/10175681.

Is there a way to run the task in the background without the user starting the script having to type an ampersand?

Thanks!