It's nice to see you here in the Community, Buck Tsai.

I can share some information regarding importing journal entries in QuickBooks Online.

If you're importing journal entries only, you can choose the Import Journal Entry. If you're importing multiple lists of data, then you can use the Import / List / JE option.

QuickBooks Online has multiple ways of importing transactions. One of these options is to import via Excel file. However, we haven't added the option for journal entry yet. The screenshot below is the data that you can import into QuickBooks Online:

As a workaround, you might want to use a 3rd-party application that fills in the gaps for QuickBooks Online with this functionality. Or, manually enter the transactions.

Also, we’re working on releasing new features soon. For product updates, you can check out our blog post for recent changes. We have resources available to help you grow and manage your business, all you need to do is visit the QuickBooks Resource Center for more information.

I'll be sharing the following write-ups below. This will provide you more information about what are the formats that are supported in QuickBooks Online as well as things to remember before importing your data:

Which contact fields are imported from Excel?

Common questions about importing data to QuickBooks Online

If there's anything else I can help you with, please let me know. I'd be more than willing to lend you a hand.