I would like to move a trend template created in configuration.yaml to a category under Helpers. This is not possible because a unique_id is missing. However, according to the documentation: Trend - Home Assistant, this value cannot be created manually either.
When I create the trend via the UI editor, it can be assigned to a category. That is not consistent.
True, but it is consistent with a lot of things configured in .yaml that don’t allow a unique_id.