Microwave the cream cheese with 1 tablespoon of heavy cream until the cream cheese is softened. Transfer it to a Ninja Creami pint, add the sugar, and whisk until the sugar dissolves.
Slowly pour in the remaining heavy cream and milk, stirring until fully combined.
Place the lid on the pint container and freeze for 24 hours.
After freezing, remove the lid and attach the container to the Ninja Creami. Select the ice cream setting and let it churn through the entire cycle.
Once done, remove the pint from the machine and scoop the ice cream into bowls immediately.