A followup to this question.
One of the practices I have seen in this pandemic age is that one individual gets all the aliyot (often the one doing the laining). In that case, not only is there no question about who gets the next aliyah, but there needs to be no notification of it. Does each aliyah have to be announced in any form or can the reader just go from making the "closing bracha" for one aliyah right into making the "opening bracha" for his next aliyah? Is there some independent purpose or need for announcing the aliyah?