Prepare the Ice Cream Base: Add cream cheese, strawberries, milk, heavy cream, sugar, vanilla extract, and lemon juice to a high-speed blender. Blend on high speed for 30-45 seconds until completely smooth. Scrape down sides if needed.
Freeze the Base: Pour the blended mixture into a clean Ninja Creami pint container, not exceeding the MAX FILL line. Level the surface with a spoon. Secure lid and freeze on a level surface for at least 24 hours until completely solid.
First Spin: Remove frozen pint from freezer and remove lid. Place container in Ninja Creami outer bowl, secure lid assembly, and select ICE CREAM function.
Prepare Graham Cracker Swirl: While ice cream processes, combine graham cracker crumbs, melted butter, and brown sugar in a small bowl. Mix until it resembles wet sand.
Re-Spin for Creaminess: Make a small well in the center of processed ice cream. Add 1 tablespoon milk, secure lid, and select RE-SPIN function for ultimate creaminess.
Add Mix-ins: Create another small well down to the bottom of the pint jar. Add graham cracker mixture to the top and pack down with back of spoon. Secure lid and select MIX-IN function.
Serve: Serve immediately with remaining graham cracker mixture on top and garnish with fresh strawberries.