With CSV format you will be able to export your issues and import them into another Jira instance. You can choose the delimiter, select between Comma, Semicolon, Vertical bar or Caret.
Rows look like this
Every row in the CSV file is an issue, it does not matter the content type you are exporting.
All exported data (fields with single selection, fields with multiple selection and extra content) will render their values in a single data separated by the selected delimiter.
WORK IN PROGRESS