Using Atlassian Companion Excel Spreadsheet xlsx: Justification not displayed correctly

[Lisa]

Within a Confluence page, using the Atlassian Companion to successfully upload and display an Excel spreadsheet (xlsx).  All of the formatting (borders, fills, font type & size) are correct.  The justification, though, is all left, no matter what I specified.

Any way to maintain the justification in the Excel spreadsheet?