Thank you for your question. Presently, the best way to import topics would be to submit a POST request to the endpoint- "https://YOUR.COMMUNITY.URL/api/v1/topics1" with Authorization bearer code. To know how to authenticate, please visit this question-https://community.tribe.so/question/is-there-a-step-by-step-guide-on-how-to-authenticate-your-access-to-use-tri--5ef4b937ec2bf659fa38fa44?answerId=5ef4b9a4482e475c1af2a8ed46. If you would like to review or read more about request parameters, please visit- https://docs.tribe.so/#create-a-topic2
Hope this answers your question!