adding proper format

.gitea/workflows/convert-html-docs.yaml

@@ -279,9 +279,10 @@ jobs:
                           "DOC_PDF_NAME": doc1.get('pdf_name'),
                       }
           
+                      doc_parameters = json.dumps(env_vars, indent=4)
+                      doc_parameters = "doc_parameters=" + doc_parameters
                       with open(os.environ['GITHUB_OUTPUT'], 'a') as fh:
-                        fh.write("document parameters:")
-                        fh.write(json.dumps(env_vars, indent=4))
+                        fh.write(json.dumps(doc_parameters, indent=4))
                       # Export env vars for convert_doc command
                       env_str = " ".join([f'{k}="{v}"' for k, v in env_vars.items() if v])