also, another hack, current Absinthe.Relay.Connection actually using offset pagination internally rather than cursor (keyset) pagination, so if you are able to get offset data (which, again, is page_size * page_num), you could use Absinthe.Relay.Connection.offset_to_cursor to transform offset to cursor, like

offset = page * first - 1

    after_cursor =
      case offset do
        -1 -> nil
        _ -> Absinthe.Relay.Connection.offset_to_cursor(offset)
      end

    new_p_args =
      p_args
      |> Map.delete(:page)
      |> Map.put(:after, after_cursor)

Warning though, this is implementation detail, it might break on newer release on Absinthe.Relay.Connection