BUG #18216: Unaccent function is unable to remove accents (diacritic signs) from Japanese character 'ド'

The following bug has been logged on the website:

Bug reference:      18216
Logged by:          Shailesh Totale
Email address:      shailesh.totale@sailpoint.com
PostgreSQL version: 13.8
Operating system:   Linux
Description:        

Hello team ,

PostgreSQL's unaccent module does not use Unicode normalisation, but only a
simple search-and-replace dictionary. The dictionary, unaccent.rules
(https://github.com/postgres/postgres/blob/master/contrib/unaccent/unaccent.rules)
  , does not contain these Japanese  characters, thus  its unable to remove
the diacritic signs.  Can someone please guide when we can expect these
Japanese characters will be added.

Also tried to check with latest versions of Postgresql still the latest
version does not have support for the Japanese characters.

https://pgpedia.info/u/unaccent.html

Thanks,
Shailesh