There's no nice way to do that. You would in fact need to automate the user interface of Outlook, which is a huge pain to do in most cases. If you do try it and have used the Copy cells from Excel worksheet action to copy the range, you can try the Send keys action to send {Control}({V}). This is the correct syntax to send Ctrl+V. It should work in theory, but it will paste it with the default paste options.
Is your formatting very difficult to reproduce? I would suggest to instead use Read data from Excel worksheet to get the data into a list/data table and then process is according to the format you need. You would then not need to automate the UI of Outlook, as you could simply use the Send email through Outlook action to send the message.
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