Jan
Thank you for your question and enthusiasm for improving your golf game! We are sorry to hear about your shoulder. Feel free to put the club across your chest in this movement if that is easier, nothing is lost. With the club across your chest, one thing you will want to be sure you are still doing in the backswing is slightly lifting your ribs as you push back slightly into your glutes and load slightly down into your legs. With the club across the shoulders it makes this a little easier to feel but it can still be done/felt just as effectively with the club across your chest.
I hope this helps, let us know if you have any other questions related to the shoulder. Happy training!