Vectorizable notation

Is possible to have a mark to indicate whether that particular function is vectorizable (meaning, can process element-wise) throughout the Functions Reference? Thanks.

It mostly is in R

> rstan::lookup("log")
    StanFunction Arguments ReturnType
282          log     (T x)          R

The ReturnType being R indicates that it will return something whose shape is that of x, which can be a scalar, vector, matrix, etc.