Telegex.get_chat_administrators

You're seeing just the function get_chat_administrators, go back to Telegex module for more information.
Link to this function

get_chat_administrators(chat_id)

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Specs

get_chat_administrators(integer() | String.t()) ::
  {:ok, [Telegex.Model.ChatMember.t()]} | {:error, Telegex.Model.errors()}

Use this method to get a list of administrators in a chat. On success, returns an Array of Telegex.Model.ChatMember objects that contains information about all chat administrators except other bots. If the chat is a group or a supergroup and no administrators were appointed, only the creator will be returned.