Opening a Form contained in a Word document via VBA automation from Access

From vba in Microsoft Access, how can I open a form saved in a word .docm document and set a textbox on the form to a value?

So far I have:

    Dim objwrd As New Word.Application
    Dim doc As Word.Document
   
    Set objwrd = CreateObject("Word.Application")
    objwrd.Visible = True
    Set doc = objwrd.Documents.Open(FileName:="C:\Users\db1\Documents\Test.docm", Visible:=True)

I know if I'm running code contained in the Word document I can do something like this

Dim frm As New UserForm1
frm.Show

But this code is automation code running in Microsoft Access and I don't see a forms collection in the Document object.