How would I make strawberry soft serve with an actual soft serve machine?

soft serve recipe image

ck812

The machine can have two flavors and I want vanilla and strawberry. I see that there are companies that make flavoring syrup but I can't find anywhere to purchase it. I am not interested in a "homemade soft serve" recipe. I also have no intentions of just dumping strawberry syrup into some vanilla ice cream. Any suggestions?

Answer
puree fresh strawberries with added sugar and strain through a fine mesh strainer