For an Azure AI Language Custom Question Answering project (QA1), you can import Q & A pairs directly from Excel (.xls/.xlsx) or TSV files in Language Studio. Microsoft's guidance explicitly states that when importing question-answer sources into a project, you can choose Excel or TSV. JSON, LU, and CSV are not supported as import file types for Q & A pairs in Language Studio. Microsoft Learn Additional Microsoft guidance notes that structured TXT, TSV, and XLS files can be uploaded to create or augment a project, and clarifies import/export behavior for TSV and XLS. This reinforces that Excel and TSV are the supported formats here. Microsoft Learn Microsoft References:
Move projects and Q & A pairs - "Import question and answers... option to import either an Excel or TSV file." Microsoft Learn Format guidelines for Custom Question Answering - structured TXT, TSV, and XLS supported; import/export notes for TSV and XLS. Microsoft Learn