Support for plural rules?

[vadcx]

aka declination/declension:

• https://cldr.unicode.org/index/cldr-spec/plural-rules
• GNU gettext manual explains: https://www.gnu.org/software/gettext/manual/gettext.html#index-dcngettext
• easy examples: https://localizely.com/language-plural-rules/

Judging by trn Javadoc and source code, do I read it correctly that the support for plural forms ends with static select of a plural form based on n, without following the Plural-Forms rules from PO (can't find this string anywhere)?

Thanks