This isn't going to be possible, unfortunately
The query engine in ePO 4.x doesn't support all of the SQL commands that are available. Additionally (as you've probably noticed) the export / import side of the query engine doesn't just use the raw SQL query - it has its own format which allows it to include things like chart type and so on.
These two combined mean that even if the query engine was capable of using the additional commands, the import function still wouldn't know what to do with them.
I found that out yesterday toying with an exported query, I managed to figure out how to add some stuff but not all that I need. I'll go post something in a feature request thread/section if there is one- I think something with like this would be a good thing for a lot of folks.
Definitely put in stuff like TOP as an FMR - I think it's already been entered, but the more folks that want it the better