Hi Yuu0910,
You are right about implementing unsupported material models in LSDYNA WB.
The material card information should be modeled by performing some experiments as per the paper in the link https://www.dynalook.com/conferences/16th-international-ls-dyna-conference/constitutive-modeling-t7-1/t7-1-d-constitutive-modeling-115.pdf
or taken from the published literature sources and an example source on Mapel and Ash woods Material models are described in the link https://www.researchgate.net/publication/328971285_Characterization_of_Maple_and_Ash_Material_Properties_for_the_Finite_Element_Modeling_of_Wood_Baseball_Bats?_tp=eyJjb250ZXh0Ijp7ImZpcnN0UGFnZSI6Il9kaXJlY3QiLCJwYWdlIjoiX2RpcmVjdCJ9fQ
Make sure you follow consistent units with LSDYNA WB.
Cheers, Ram