Is your suggestion for improvement related to a problem? Please describe.

The BibLaTeX manual gives a number of "unsupported" styles of specific names, recognized but treated as @misc. Certain styles, particularly biblatex-apa, support these. In particular, the legal styles such as jurisdiction (court cases), legislation, etc.

Of particular note is the style example for jurisdiction provided by biblatex-apa:

@JURISDICTION{11.4:5,
  TITLE                = {Durflinger v. Artiles},
  CITATION             = {563 F.Supp. 332 and aff'd and 727 F.2d 888},
  CITATION+an:citeorg  = {1="D. Kan.";3="10th Cir."},
  CITATION+an:citedate = {1="1981";3="1984"},
  CITATION+an:citeinfo = {2=appeal},
  URL                  = {https://openjurist.org/727/f2d/888/durflinger-v-artiles},
  DATE                 = {1984},
  ORIGDATE             = {1981}
}

These include annotation fields, CITATION+an:...

Describe the solution you'd like

Inclusion of style types for these such styles BibLaTeX treats as @misc, complete with the additional annotations, preferably under the Annotation tab.

It would be a larger change to also include automatic citation, for example Legislation based on State and code reference or bill references, or Court cases based on jurisdiction and case number, etc., as this would entail pulling information from many, many sources, all with different presentation. The scope of this issue is merely providing the style type for selection by the user, who will fill in the details on their own, and excludes any such automated reference generation.