Could my friend give (full/partial) custody of her 1 year old child and her unborn child to someone before she gives birth & they both get taken?

My friend got caught sleeping in her car with drugs on the floor of the area she was sitting and had her 1 year old in the carseat in the back seat. The cops sited and released her and her new boyfriend (not the father of the 1 year old, hes in jail) that she is currently 30 weeks pregnant by , but CPS has showed up to her house 3 times already & the last time was with law enforcement , which probably means they were planning on taking the 1 year old im guessing. She was not home all 3 times (she hasnt been home shes living in hotels with her new boyfriend). She is also a drug addict & currently using. Her baby is going to be born withdrawing from fentanyl & will be taken from her on the spot. There are several people including me that are willing to take responsibility of the children in order to avoid getting them taken away & shes willing to sign over custody. She doesn’t plan on getting clean. Could we write out an agreement & have it notarized? We live in San Diego, California.