adds map / slice helpers

internal/tplactions/httpjson/httpjson.go

@@ -81,6 +81,16 @@ func (a *Actions) FuncMap() template.FuncMap {
 			}
 			return s, nil
 		},
+		"MapGet": func(key string, m map[string]any) any {
+			return m[key]
+		},
+		"SliceGet": func(index int, s []any) any {
+			n := len(s)
+			if index < n {
+				return s[index]
+			}
+			return nil
+		},
 	}
 }