How can I map worklog field while Importing worklog entries

[Naveen]

I have been creating subtasks in jira through IMPORT CSV as mentioned in 

https://confluence.atlassian.com/adminjiracloud/importing-data-from-csv-776636762.html

but while doing it for "Importing worklog entries" 

In JIRA field mapping page, 

Summary - Summary

Worklog - (*I didn't find any field related to work log *)

Can any one help me on this.

Thank you