OGC Services - Get numerical pixel values in vector format

I have a question about the OGC Services Sentinel Hub provides.

I am interested in requesting numerical vector data for different composite indices. Statistical API is useful for this but there are use cases when I need numerical pixel-values of different composite indices.

I noticed that OGC Services (such as WMS) always return hexadecimal color codes, regardless of sampleType defined in evalscript’s setup() function.

Is there any way for WMS (or other OGC Services) to return numerical pixel values instead of hexadecimal color codes?

Thank you