Thank you for your continued feedback, we have addressed #1 in the list above. Contextual search within a specific chat or channel is now available. To learn more, please visit https://support.microsoft.com/office/search-for-messages-and-more-in-teams-4a351520-33f4-42ab-a5ee-5fc0ab88b263.
The feature team continues to make progress on these asks, and we will share an update when one is available.
This item remains on the backlog.