Trouble adding Assignee into bibliography style - still not possible?

I want to add the company into an citation style which have that lines for patents:

[else-if type="patent"]
[group delimiter=", "]
[text variable="title" text-case="title" font-style="italic"/]
[text macro="year-date"/]
[text variable="number"/]
[/group]
[/else-if]

which gives

[1] O. Dicoi, E. Doerr, Continuous Process for the Recovery of Caprolactam, 1978, US4107160.

By adding [text variable="assignee"/]

I want something which looks like this:

[1] O. Dicoi, E. Doerr, Continuous Process for the Recovery of Caprolactam, 1978, US4107160, Zimmer AG.

I looked into https://aurimasv.github.io/z2csl/typeMap.xml#map-patent and there is no variable for assignee. So is it still not possible to add a company?
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