Hey @hirakawa平川 - welcome to the Community!
Custom Fields is now a core product feature for Trello Standard, Premium, and Enterprise, and is no longer available as a Power-Up.
If you currently have the Custom Fields Power-Up enabled on an existing free board, you can continue to use the feature on that board. However, any newly created boards within a free Workspace will not have the Custom Fields Power-Up available.
Despite these changes, you do not need to worry about any data loss with Custom Fields on your existing boards. Underlying Custom Field data is never lost when you copy or move boards between paid or free workspaces. However, if you copy a board into a new workspace you may need to upgrade to Standard or higher in order for Custom FIelds to be available.
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