It is indeed time saving and accurate for auto-populating information in Form 941. Currently, QuickBooks Online (QBO) doesn't supply any information under Part 5 of your 941 form, Kklow.
Since this section includes the taxpayer's signature, title, and date, you'll need to manually enter or fill out the information to ensure compliance with IRS requirements and be able to submit the form. To know more on how QuickBooks populates each line, check out this article for more details: How QuickBooks populates Form 941.
If you have any other concerns and additional questions about your 941 information, please let me know. The Community team is always right here to ready to assist you.