{"text_format":"3","workbook":"xlsx","n_sheets":2,"sheets":["SomeName","SomeOtherName"],"read":"whole","date_system":"1900"}

{"sheet":"SomeName","index":0,"n_rows":1,"n_cols":2,"rows_kept":1}
[null,{"$f":"CONCATENATE(\"Prefix \",MID(CELL(\"filename\"),FIND(\"]\",CELL(\"filename\"))+1,255), \" Suffix\")","v":"Prefix SomeName Suffix"}]

{"sheet":"SomeOtherName","index":1,"n_rows":0,"n_cols":0,"rows_kept":0}