Change behavior of bash script if executed from another script

I have a script (say Task.sh) (with executable permission): Pseducode:

if [[ Not called from inside a script ]]; then
  echo 'Not called from inside a script'
else
  echo 'Called from a script'
fi

--- I have a script say Main.sh (with executable permission):

Value=$(Task.sh)
echo "${Value}"

--- # Expected Outcome

$ Task.sh
Not called from inside a script

$ Main.sh
Called from a script

# Help Request Please suggest what conditional to put in the pseducode for Task.sh