The "demonstrated" crosswind value will be stated in Section 5, Performance, of a "GAMA format" Flight Manual. It will not be found in Section 2, Limitations, because were it to be there, it would become a limitation, and it is not.
The test pilot, who confirms the demonstrated crosswind capability, will find the required crosswind, which will be at least 0.2 Vso. There is no reason for the test pilot to demonstrate a value greater than that, as doing so, and stating it, would only invite liability, for zero corporate gain.
If the operator chooses to limit the use of their aircraft to a stated crosswind "limit" that is their prerogative, as they are responsible for the plane. But, doing so rigidly introduces other unintended consequences, such as a pilot having to divert because of reported crosswind, and not getting the plane back as intended.
Other than for very gusty crosswinds, or mechanical turbulence, I have never found the 0.2Vso crosswind intensity terribly challenging, so pilots should probably challenge themselves a little more to build confidence!