In the hayagriva format, the arxiv number is including in the "serial-number". When I use a CSL style to render the bibliography in typst, there is no ready-made CSL style to render arxiv numbers. I want to manually modify the CSL file myself, but I cannot find the corresponding arxiv variable in the CSL manual.

Some people say that eprint=number and eprinttype=genre can be used equivalently, but this does not work with the following csl code:
text variable="number"
text variable="genre"

Can someone help solve it?

ALEPH:2001hzl:
  type: article
  title: '{A Combination of preliminary electroweak measurements and constraints on the standard model}'
  author:
  - Abbaneo, D.
  - others
  date: 2001
  serial-number:
    arxiv: hep-ex/0112021
  parent:
    type: periodical