[thredds] applying functions (filtering, seasonal signal removal) to served time series

Here's what I'm trying to do, but I'm unsure of the simplest method:

I have a netCDF file of gridded sea surface heights over time. I'd like
Ramadda (or ERDDAP or THREDDS) to serve time series from that file at
specific lat,lon requests. But I'd like to apply some filters to the time
series before sending on as JSON data to the client. Is there a method to
apply intermediate processing or internal server functions to data prior to
sending the data, perhaps specifying the function call in the URL? I guess
this is like server-side processing in GRADS or F-TDS? I've seen some
discussions about doing NCO ncwa or perhaps applying IDV functions to data
in Ramadda, but I'm not sure if this is documented and how to implement
something similar. Any advice is appreciated.
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