That's totally up to the sampler you are triggering, Reaper can't possibly know unless there was some standard for reporting this that it could then display in it's GUI.
It's very common. Drums are often 8-12 velocity layers which play at ramping volumes into one another. A common way to set this up is to normalize all samples to the same volume, then do the volume purely in the software for a smooth transition.
Some samplers fake it using filters or compression.
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