how about this

Author: joshuadavidthomas

.github/workflows/test.yml

@@ -40,8 +40,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        django-version: ${{ fromJSON(needs.generate-matrix.outputs.matrix.django-version) }}
-        python-version: ${{ fromJSON(needs.generate-matrix.outputs.matrix.python-version) }}
+        include: ${{ fromJSON(needs.generate-matrix.outputs.matrix.include) }}
     steps:
       - uses: actions/checkout@v4
 

noxfile.py

@@ -125,14 +125,16 @@ def lint(session):
 @nox.session
 def gha_matrix(session):
     sessions = session.run("nox", "-l", "--json", silent=True)
-    matrix = [
-        {
-            "django-version": session["call_spec"]["django"],
-            "python-version": session["python"],
-        }
-        for session in json.loads(sessions)
-        if session["name"] == "tests"
-    ]
+    matrix = {
+        "include": [
+            {
+                "django-version": session["call_spec"]["django"],
+                "python-version": session["python"],
+            }
+            for session in json.loads(sessions)
+            if session["name"] == "tests"
+        ]
+    }
     with Path(os.environ["GITHUB_OUTPUT"]).open("a") as fh:
         print(f"matrix={matrix}", file=fh)