...
DEMO-1,2021-03-23 09:00:00Z,1h,test,accountid:557058:7f5bbab3-79c0-446c-b480-834e4fbcaf7c
Note, you can figure user accountId by opening user profile and seeing accountId in browser address bar, e.g. https://timereports.atlassian.net/jira/people/5e29a79aadb9030e6a441d2b
It is recommended to import data from current period to see added worklogs.
...