How to use schedule_date flag in sendMessage

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Question

Hello. How can the schedule_date flag from the official documentation https://core.telegram.org/method/messages.sendMessage be used in the bot.sendMessage method?

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This example doesn't working:

await bot.sendMessage(activity.target.id, 'result', {
    // todo - after 1 minutes
    schedule_date: Math.floor((new Date(new Date().getTime() + 1 * 60000)).getTime() / 1000),
  })