Align floating elements

[SystemError7]

Hi,
I used the following script that the user @dothinking in the following issue of pdf2docx:
ArtifexSoftware/pdf2docx#54
to create a floating image, then I tried to do a center align to the image but it didn't work, so I want to know if it's possible to align a floating Office Word element, I suppose it's like a drawing.

[dothinking]

Floating image means you can put it where you want to, so you're not able to align it center like a normal flowing element. Instead, you can calculate the position (x,y coordinates of top-left corner) where it's center aligned, then set it directly when creating the floating image.