Any alternative solution for caption / subtitle thru scripting?

Hi

I'm looking for a solution to auto import and place captions / subtitle in timeline. I have just mocked with MOGRT, by importing multiple times and updating its source text value. But its not working as subtitle CEA 708 for TV standards, my as my client reported.

I tried few methods, but none working.
- Imported a srt file and placed to timeline; I thought reimporting same file with different content would update captions in timeline. But instead PPRO just imports and treats as a new file.

- Thru script tried with insertClip, it returns no error at the same time captions not placed in timeline

- Looked for xml format of prproj, no option in export or save as; then changed extension to zip and opened, seemed xml with base64; decoding base64 didn't work as expected

- Tried with QE; but not much accessible and Adobe says not recommended.

@Adobe -Why PPRO is poorly support scripting?

Please suggest if there is a way to handle captions. Thanks in advance!

My premiere pro ver - CC 2021(15.0)