Welcome to the QuickBooks family, @hagupta.
I can share some insights about the categories in QuickBooks Online. When exporting expenses to Excel, our system is designed to only show the texts after the colon, which is the actual sub-account name.
Right now, including the entire information is currently unavailable. I recommend checking out the following screenshots to help you know more about the process:


I understand how the workflow you're looking for is beneficial to your business. To ensure your voice is heard, I can pass along another feature request on my end.
For the time being, you can visit our blog and sign up to our Newsletter. This way, you’ll receive email updates about changes in the product.
In case you want to learn more about exporting and not limited to expenses, I'm attaching this article: Export reports, lists, and more.
If you have additional questions or concerns while working in QBO, leave a comment below. I’ll be happy to help you out.