You can consider reporting to the Red Cross Training Department. At present, the Red Cross and the American Heart Association are mainly responsible for first aid training related to cardiopulmonary resuscitation. Both of them usually belong to paid training and issue certificates. However, considering the public welfare nature of the Red Cross, we can actually negotiate with them and ask the ambulance trainer to give a public welfare lecture. Anyway, it doesn't matter that no one needs to get a certificate.