Returns specific timesheet activity

{
  "data": {
    "id": 1,
    "timesheet_id": 1,
    "assignment_id": 1,
    "documentation_id": 1,
    "type_id": 1,
    "duration_seconds": 3600,
    "start_lat": 48.137154,
    "start_lng": 11.576124,
    "end_lat": 48.137154,
    "end_lng": 11.576124,
    "first_line": "First line",
    "icon": "fas fa-tasks",
    "color": "#000000",
    "contrast_color": "WHITE"
  }
}