Do you want to keep the presence of the attendees available while they are in the meeting without manual setup?
If so, I'm afraid it is not available for now. Teams will automatically convert the user's presence to Busy when the user participates in the meeting.
You have to make it available manually.
To get this feature more quickly, I have found a feedback in Teams UserVoice and you could vote for it. Many features of our current products are designed and upgraded based on customers' feedback. With requirements like this increase, the problem may well be released in the future. Thanks for your understanding and support.
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