Extract form-filling values from a PDF document that supports Acroform

[hoangthanh283]

Checklist

• I confirm this is not a question or feature request. Otherwise, use the Discussions page. Note: Was edited out by reported, added back by @mara004.
• I confirm this is not an issue encountered with an installed build of pypdfium2, but about some other aspect of the project (specify below). Otherwise, use one of the package templates (PyPA/conda), even if you believe this is not a package-specific issue.
• I confirm this is not about an unofficial build of pypdfium2. We do not support third-party builds, and they are not eligible for a bug report.

Reason for Generic issue (keyword/topic)

Looks like that pdfium supports to extract values in a form-fill PDF file but there is no visible API to do that

Description

I can check that in this document, the PDFMiner supports to detect if the document contains form-fill values or not. But there is no clearly API from the official document to do the form-fill value extraction.
For example, in this document (attached as below):

pdf = PdfDocument(pdf_path)
print(pdf.get_formtype()) #  = 1

Can you please show me what API should I use to extract the form-fill values.
MedicalAttorney-6.pdf

[mara004]

This is a feature request, and you are not supposed to edit the template!
Converting to discussion.