Question: who had cameo roles in mamma mia here we go again
[{'answer': 'Björn Ulvaeus', 'provenance': [{'wikipedia_id': '54535911', 'title': 'Mamma Mia! Here We Go Again', 'start_paragraph_id': 40, 'start_character': 239, 'end_paragraph_id': 40, 'end_character': 252, 'bleu_score': 1.0, 'section': 'Section::::Musical numbers.\n'}]}, {'answer': 'Benny Andersson', 'provenance': [{'wikipedia_id': '54535911', 'title': 'Mamma Mia! Here We Go Again', 'start_paragraph_id': 40, 'start_character': 162, 'end_paragraph_id': 40, 'end_character': 177, 'bleu_score': 1.0, 'section': 'Section::::Musical numbers.\n'}]}, {'answer': 'Jonathan Goldsmith', 'provenance': [{'wikipedia_id': '54535911', 'title': 'Mamma Mia! Here We Go Again', 'start_paragraph_id': 35, 'start_character': 12, 'end_paragraph_id': 35, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]