How to pass a class instance in a jenkins pipeline script?

[touseef]

I have a pipeline  compliant test plugin.in a  @databoundConstructor i have 
to pass an instance of another class *Input (*consisting of n number of 
variables to be taken as input*)*


@Symbol("forget")
@Extension
public class ForgetBuilder extends Builder implements SimpleBuildStep {
    private final String what;
    @CheckForNull
    public String stuff;
    public Boolean checkbox;
    public Input Input;
    @DataBoundConstructor
    public ForgetBuilder(String what,String stuff,boolean checkbox, *Input 
Input*) {
        this.what = what;
        this.stuff=stuff;
        this.checkbox=checkbox;
        this.Input=Input;
    }

    public Input getInput() {
return Input;
}

public Boolean getCheckbox() {
return checkbox;
}

public String getWhat() {
        return what;
    }
    @Nonnull
    public String getStuff() {
        return stuff == null ? DescriptorImpl.defaultStuff : stuff;
    }


    @Override
    public void perform(Run build,
                        FilePath workspace,
                        Launcher launcher,
                        TaskListener listener) throws InterruptedException, 
IOException {
        listener.getLogger().println("What was " + what + "?");
        listener.getLogger().println("stuff was " + stuff + "?");
        listener.getLogger().println("checkbox was " + checkbox + "?");
      
        
        
    }
    
I an able to write the pipeline script by which i can pass the arguments 
like string ,boolean etc.But im not sure how to pass the instance of 
another class in script


//script works fine with primitive variable ,can any please help me in how 
to pass the instance of another class after setting it variable to the 
below script
step([$class: 'ForgetBuilder', what: 'first string arg', stuff: 'Secong 
string arg' ,checkbox:true])

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