Let me checkBTW which version of AEM forms are you on?

https://experienceleague.adobe.com/en/docs/experience-manager-learn/cloud-service/forms/developing-for-cloud-service/registering-servlet-using-resourcetype

In the documentation link that you are following, there is sample syntax to access field values does that not work for you?can you send us the form?

A new way of form fillingwe have create a simple demo using ChatBot to ask questions and fill out a pdf form from the answers collected using ChatBotA video recording of the demo is available herehttps://experienceleague.adobe.com/en/docs/experience-manager-learn/forms/chatbot-and-aem-forms/introduc...

Create form based on foundation components I don’t think you can mix and match core components and foundation components in one form

We are constantly adding new core components . I think the components you mentioned are on the to do list

For the cloud you have to use the http rest api for document generation I have given the links to you in the previous reply 

Are you using the cloud service or 6.5if using 6.5 follow this https://experienceleague.adobe.com/en/docs/experience-manager-learn/forms/document-services/output-and-forms-services-article-develop# if using cloud follow this link to generate pdf https://experienceleague.adobe.com/en/docs/experience-...

Can you please tell us what is the use case that you are trying to accomplish?

You are mixing 6.5 with cloud service packages