The Rock came to know about the youngster's bravery on Thursday (24 August) and tweeted, "Wow awesome story".
According to WXYX-TV, Jacob found Dylan floating face down in their grandmother's swimming pool.
Johnson was apparently impressed by the heroics, and touched that Jacob "learned how to do this by watching this big, brown bald tattooed guy in his favourite movie", he said in the video. "My favourite movie, "San Andreas", had compressions (CPR) in the movie and I remembered it from the part in the movie where there was an quake, then there was a tsunami, and the girl was drowning".
Dylan was then rushed to hospital and went on to make a full recovery.
Jacob said he remembered Johnson doing chest compressions in the scene; he mimicked them on his brother, an act credited with saving the toddler's life. Jacob recalled how the compressions were done in the film and successfully performed CPR on his younger brother.
"In most movies, that's what they do".
Dylan was in the water for nearly a minute, according to WXYZ.
Jacob's mother, Christa O'Connor, said that she was at a "loss for words" and that she was immensely proud of her son.
Vial has since installed double locks on her back doors to prevent a repeat incident.
Thankfully, Dylan suffered no permanent damage, and after a two day stay at the hospital, returned home as happy as ever.
"You're a real life hero", The Rock wrote in one of four tweets about Jacob's actions. Jacob, I'm so proud of you so much so that I've got to meet you.
"Thankfully we've been so lucky and it's like it never happened", she said. But nope, that's not how Jacob garnered the well-beyond-his-years, life-saving knowledge that saved his little brother's life.