How to pass a list (or a transform vector) to the parameters of a Houdini instance Actor?

I am instantiating a Houdini Actor to unreal using python

Now, as per the documentation you can theoretically pass a vector to the float parameters and it would get automatically recognized as a transform vector, however, whenever I do that the engine treats the parameter as a single float value and not as a transform vector

Is there a specific unreal method different to unreal.HoudiniParameterTuple that is used to assign vectors instead of single values?

What I am trying to set:

input_parameters = {
# Pending pass entire vector to parameter function and not only a single vector
‘size’: unreal.HoudiniParameterTuple(float_values=((5.0,5.0,5.0)))
}

Only the first attribute is being recognized

The parameter in Houdini is set up the following way: