log4j-layout-json-template/src/main/resources/StackTraceElementLayout.json

{
  "class": {
    "$resolver": "stackTraceElement",
    "field": "className"
  },
  "method": {
    "$resolver": "stackTraceElement",
    "field": "methodName"
  },
  "file": {
    "$resolver": "stackTraceElement",
    "field": "fileName"
  },
  "line": {
    "$resolver": "stackTraceElement",
    "field": "lineNumber"
  }
}