ffs.cs

var missionMarker = new Scaleform("mp_mission_name_freemode");

if (missionMarker.IsLoaded == false) {
  Debug.WriteLine("SF not loaded");
  return;
}

var name = "Unique name";
var type = "Some cool mission type";
var playerInfo = "Player info";
var percentage = "";
var debugValue = "";
var isRockstartVerified = true;
var playersRequired = 4;
var RP = 999;
var cash = 9999;
var time = "";

missionMarker.CallFunction(
  "SET_MISSION_INFO",
  name, type, playerInfo,
  percentage, debugValue, isRockstartVerified,
  playersRequired, RP, cash, time
);
missionMarker.Render3D(
  Game.PlayerPed.GetOffsetPosition(new Vector3(0, 2f, 0)),
  -Game.PlayerPed.Rotation,
  new Vector3(1f)
);