Declined... What credit do I use, please?

TLDR: What credit do you use for "Original film by" (and which section does it go in)? 

(Already tried: using Original film by and Screenplay in the written-by section, but both declined... so any suggestion here please? 

See credit listed here: 

https://www.nationaltheatre.org.uk/productions/after-life 

_____________________________________________ 

Full previous declines: 

260430-180928-798000

title: National Theatre Live: After Life (2021)

submission: adding name Hirokazu Koreeda to the title, as he is credited as 'original film by' on this title. 

Q: If this is not acceptable under the Help guidelines, then what should I use instead?

(note: I previously tried 'screenplay' as the credit, but that was declined as well. So I'm stuck, lol!) 

links in submission below: 

https://help.imdb.com/article/contribution/filmography-credits/crew-credit-guidelines/GNHXXUGBUDKEUUMJ#writer 

https://www.nationaltheatre.org.uk/productions/after-life

trivia explains: https://www.imdb.com/title/tt42107208/trivia

original film title based on: https://www.imdb.com/title/tt0165078/reference 

Thanks in advance.