I notice that Notion, Clickup, Monday.com all have tools for easy import to Trello.
I think the reason why there isn't something similar for Trello is that These solutions are all newer or with a much smaller user base so they are actively seeking to gain users from Trello. Trello on the other hand has been established for a long time and doesn't necessarily need to pull customers from the other solutions. Also Atlassian are quite focused on enterprise, where this is less of a requirement.
Once option is to export your data from notion to CSV and import to Trello using something like Import to Trello by Blue Cat powerup.
You could also use a solution like Zapier, Make or Integrately to sync data to Trello (my personal favourite is Integrately)
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