JQL - Aggregate Expression Simple Math, but Possible to Round Answer to 2 Decimals?

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Hello - 

On a project I am working on, in the Search for Issues section, I am using an aggregateExpression to subtract to custom number fields that I have. The expression looks like this:

aggregateExpression("Name of Output", "customfield_12900.sum() - customfield_12805.sum()")

This JQL expression gives me the difference of the 2 fields, however, the answer is displayed with 13 decimal places. Is there a way to add to this JQL expression in order to make it round to 2 decimal places?