List down all the possible attributes in figma property in plugin

Hi Could I ask a question?

I have a componet called Fruit. I created an intance of Fruit in my Figma document. It has properties like colour, origin
Suppose possible options for colour are Green, Red, Orange, DarkRed
Suppose possible options for origin are Indian,Netherland,England,France

It will come under variant properties. So in my plugin, I will set colour=Green using setProperties API.

I read this property Green Blue etc from a txt file. So sometimes there is a chance that Green is green(Capital letter,small letter issue) and Figma plugin throw error if there is no exact match. So in plugin I would like to read all the possible combinations of colour before throwing an exception. How can I do that?

For example, if I click fruit instance node, can I iterate through its properties like colour and origin then list all available values of colour and origin to a string array? So before I assign colour = inputFromTextFile, I can check if InputFromTextFile is Green or green.