Able to allocate tags to Journal is currently not an option for QuickBooks Online (QBO). And as for the project, you can assign a journal line to a customer/project by selecting them/it under the 'Name' column.
I can see how the feature you're looking for would benefit and empower your business. In the meantime, I recommend sending this request straight to our product engineers through feedback.
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Feel free to reach out to me if you need anything else. I'll be here to help. Have a good one!
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