Pass Parameters to Quick Create Form in Dynamics 365 using formContext.data.attributes

With the deprecation of Xrm.Page.context.getQueryStringParameters, Microsoft Docs article suggested using formContext.data.attributes API to make retrieval of non-entity bound data consistent across entity forms.
But some of the sample codes that I found online are all using the deprecated Xrm.Page.context.getQueryStringParameters and some are using undocumented Xrm.Utility.getGlobalContext().getQueryStringParameters(). I found some forum thread saying that "getQueryStringParameters" itself is deprecated regardless of whether is from Xrm.Page or Xrm.Utility.
So here is a sample code on how to pass parameters to another form. In this example, I am trying to pass the custom parameter from the main form of an entity to the quick create form which is opened by Xrm.Navigation.openForm API.

First of all, you will need to add the parameter in the Form Properties of the form that you are receiving the parameter (Quick Create form in this case). Follow this Microsoft Docs article to set the name of the parameter

Note: If the parameter is not working on someone else's machine, you might want to add the parameter in the main form as well according to Daryl LaBar.

This is the sample code on my Main form where I am passing the parameter lzw_test_parameter and open the Quick Create a form using Xrm.Navigation.openForm

 var entityFormOptions = {};  
 entityFormOptions["entityName"] = "contact";  
 entityFormOptions["useQuickCreateForm"] = true;  
 var formParameters = {};  
 formParameters["lzw_test_parameter"] = "Test parameter value"; // Custom Parameter  
 Xrm.Navigation.openForm(entityFormOptions, formParameters);

This is the sample code on my Quick Create form where I am getting the parameter passed by the other form

 if (formContext.data.attributes.get("lzw_test_parameter") !== null) // sample code for getting non-entity bound data  
 {  
   Xrm.Navigation.openAlertDialog({ text: formContext.data.attributes.get("lzw_test_parameter").getValue() }); // This will show the alert "Test parameter value"  
 }