I’m trying to add a string on a shipping label which is under pdf. I’m not 100% sure if using python to do this task but as a noob that just got into coding world, it’s the only language that I can write something down.

The goal is simple. I want to add a string on the pdf file but the output pdf file should have the same text layout as the original file. I successfully read the pdf file with PdfMiner library and now converting the line of string to original shipping label layout as PDF is a little struggle for me.

Is there any method to rearrange lines of strings with divided sections and layout as pdf?
If other language has the better approach, please let me know!
Initial File and Output Goal
For better understanding please see the initial file and output goal.

Thank you so much in advance.