See https://www.softwareheritage.org/2020/05/26/citing-software-with-style/

biblatex-software is actually a bibliography style extension, which means that one can add support for these four software entry types to any other BibLaTeX style used in documents typeset in LaTeX, like the biblatex styles for ACM articles. It requires the Biber back end, though, so do not try it with pure BibTeX.

We should add the new types and fields in BibLaTeX mode.