I see three options:
• add the jsonpath builder to the strikt-jackson module as a test only dependency and add documentation to add the jsonpath lib as a compile dependency in your project
• add the jsonpath builder to the strikt-jackson module as a compile dependency so it gets included when including strikt-jackson in your project
• add the jsonpath builder to a separate strikt-jsonpath module as a test only dependency, this could be useful to implement more jsonpath builders that also support other json providers like Gson or JsonOrg