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Can't create custom variance metric

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# 1
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I have a time series graph containing the maximum 10 series (goal completion locations) from a possible 200+, currently sorted by goal completions (descending).


I want to be able to choose the 10 "most interesting" series by applying a filter with a custom metric. For example, I would like to be able to filter out any goal completion locations with a variance in daily completions below a certain level over the last 30 days until only 10 remain. 


I have tried to create a metric which is the variance of the 30 data points, but Data Studio treats Goal XX Completions as an aggregated metric and I can find no way to treat each day differently as a result.


As a last resort, I have also tried to create a metric which is the range of daily Goal XX Completions over the last 30 days so that I can choose the 10 events with the biggest range, but I had no luck here either.


Apologies if any of this is unclear. I would be immensely grateful if anyone was able to help me sort this out so that I can get on top of optimising my conversions.