Because Jira Cloud doesn’t expose the API to get its work log data, to make sure Teamboard sync well with Jira’s data you may switch the Time log provider to Teamboard which will sync and write the data to both Jira and Teamboard.
Go to Admin → Issues → Time tracking and change the Time tracking provider to Teamboard
After that, you can use Teamboard’s Timelog in issues details instead of Jira’s Work log