Do you mean that you want to add more suggested tags?
If so, as you know, it has a maximum limit of 25. Given that, IT admin can give access to owners or members to manually add custom tags for teams.
Log in to Microsoft Teams admin center > Org-wide settings: Teams settings >** Tagging**: turn on Let custom tags be created. The following image also shows the process:
Then, each team can have 100 tags. The following picture is provided by official document for reference:
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