I would love this very much! I am importing my whole life into Obsidian as we speak, and it would be massively useful to have a plugin that would search through my whole vault, find likely tags (by identifying strings that appear frequently in the vault, for example) – or assign tags to strings I specify. In fact, I’m not entirely sure I can make the most of Obsidian until there’s such a plugin, unless I’m missing something. (And if I am, please tell me!)