How to use v9.3 signature field via DocBuilder API?

Docs API
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1

I’m on Document Server 9.4 and I’m trying to use DocBuilder to add the Signature field introduced in 9.3 (for documents that have a variable number of signers).

This is how I’m doing it in the docx:

   let customerSig = Api.CreateSignatureForm({
     key: "customer_signature",
     role: "Customer",
     required: true,
     placeholder: "Signature"
   });
   // ...

And the payload for converting it to pdf with the document server:

   {
     "filetype": "docx",
     "outputtype": "pdf",
     "pdf": {
       "form": true
     }
   }

I get is an image field that always tries to open a file dialog. It doesn’t even respond to config.events.onRequestInsertImage.

References: