Extract all the key information from the following unstructured text and format it into a valid JSON object. Extract the entities: 'PersonName', 'Company', 'Role', 'Email', and 'YearsOfExperience'. If any field is missing, set its value to null. Output ONLY the JSON, without any markdown formatting or extra text.
{ "PersonName": "Jane Doe", "Company": "TechFlow Inc.", "Role": "Senior Data Scientist", "Email": "jane.doe@techflow.io", "YearsOfExperience": 8 }