Getting free to play champs

I did it with api not static api and it works, the problem is I dont know how to find the freetoplay champs with the static api because there’s no .FreeToPlay.

Code Below:

var freechamps = api.GetChampions(region, true);
foreach (var champ in freechamps)
{
     if (champ.FreeToPlay)
     {
          freechamps_txt.Text = freechamps_txt.Text + " " + champ.Id;
     }
}

The code below works to get all the champ name but i dont know how to find the freetoplay champs.

var champions = staticApi.GetChampions(region, ChampionData.all).Champions.Values;
foreach (var champ in champions)
{
      freechamps_txt.Text = freechamps_txt.Text + " " + champ.Name;
}

[BenFradet]

closing since I think the original question was answered.

[JanOuborny]

I don’t think you can, but you could do this after the game has ended.