In the JSON file, it appears that you can edit either line 3858 or 3859:
"type" : {
"description" : "The type of policy you want to create. The default policy type is Security.\n- **Parent:** A parent policy can be used as a basis for similar child policies. Parent policy settings can be inherited to its child policies. A parent policy cannot be applied to Virtual Servers. No traffic can flow through them. They are just models.\n- **Security:** A security policy can be created from a parent policy or as a stand-alone policy. Changes to a security policy do not affect other security policies. A security policy can be applied to a virtual server.",
"enum" : [
"parent",
"security"
],
"type" : "string"
},