[Python] python-docx header set anchor "to page"

Problem: put a logo image at top left position of the page.

I've tried the following to accomplish the same but it doesn't work as expected:

from docx import Document
from docx.shared import Mm, Pt
from docx.enum.text import WD_PARAGRAPH_ALIGNMENT
doc = Document()

# A4 vertical
section = doc.sections[0]
section.page_height = Mm(297)
section.page_width = Mm(210)

# tried to remove margin to position logo
section.top_margin = Mm(0)
section.bottom_margin = Mm(0)
section.left_margin = Mm(0)
section.right_margin = Mm(0)

# placed logo but still got a left margin
header = section.header
p = header.paragraphs[0]
p.paragraph_format.space_before = 0
p.paragraph_format.space_after = 0
p.alignment = WD_PARAGRAPH_ALIGNMENT.LEFT
p.add_run().add_picture("logo.png", width=Mm(210))

# restored margins for next content but trigger a break of the page
section.top_margin = Mm(20)
section.bottom_margin = Mm(20)
section.left_margin = Mm(25)
section.right_margin = Mm(20)


Manually editing the generated docx file I've found out that with image properties anchor to page it would fix.

But this option seems missing in docx code.

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