This item is still being reviewed by the feature team. No additional news to share at this time.
I too face the similar issue. I want to search specific msg in a particular group/channels but the search open takes only exact word, even if I am search a partial word it is not showing any results. Another point is, if we search anything, it gives result for all the teams where I am part of and not to a particular channel. Do we have any other option or will it be considered in the next upgrade?