QB Issue Resolution:

You can’t.

That is why we provide links to download and install 30 day trial version of our desktop software so you can install it, get to the data, and then export to QBO from within the desktop program.

https://community.intuit.com/articles/1207255-quickbooks-desktop-trial-links

Resolution for Issue 'How do you manually export Quickbooks Desktop data into QBO without using desktop software?' available: Yes (Solved).
Source: Intuit Community forum.

How do you manually export Quickbooks Desktop data into QBO without using desktop software?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Desktop program
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for Desktop program [Canada]
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Additional Support Options: