How to output value of entry key with glossaries-extra and bib2gls?

Question

For reasons similar to this question's (noun declension), I wish to refer to an entry and output an arbitrary text (in this case, a particular declension of the entry noun). It looks like entering the text as key-value pairs in the entry is a good solution.

However, the answer to the linked question only supplies an answer in vanilla glossaries. I use glossaries-extra with bib2gls and I'm not sure how to convert between them.

For the entry

@entry{duck,
    name = {anka},
    description = {A bird},
    definitiveplural = {ankorna}
}

I would like to output

ankorna

with a hyperlink to the glossary as with other terms.

My best guess has been \glsxtrusefield{duck}{definitiveplural} from page 194 in the manual, with no output as result. The manual does mention that I should use the internal field tag, but I'm not sure how to find it.

Answer 1

Indeed,

\glsxtrusefield{duck}{definitiveplural}

is correct. However, this custom key needs to be defined first like this

\glsaddstoragekey{definitiveplural}{}{\DefinitivePlural} % Placed before \GlsXtrLoadResources

as noted in the bib2gls intro, p. 11. This also lets you use

\DefinitivePlural{duck}

for the same effect.

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Internal field tags for the default keys are listed in the glossaries manual, p. 108, as noted in the glossaries-extra manual.