Profile Data Field Management for Extensions

When editing profiles on the Karoo, some of the data fields have parameters (e.g. "Speed" allows the user to select 0s, 3s, 5s, or 10s smoothing). Others have variations on the data field (e.g. Heart Rate allows the user to select Numeric, Visual, and Zone Color.) Some have both parameters and variations ("Power" provides options for smoothing AND 3 data field types.)

How can I achieve this with custom fields?  My app has 45 custom (graphic) fields, which are all really variations on the same underlying 10 base fields. Right now the data field picker lists all 45 sequentially. I would like to cluster them by the 10 base field types to make scrolling easier for the user. 

I don't see any way to do this; The extension_info.xml seems the place that I should be able to specify this, but it doesn't provide any way to tag a data field as belonging to a group of data fields.

Any suggestions? Or is this just something that the Karoo hasn't exposed externally?