So there are a couple of options...

Export could be by use of ZC currency style "conversion" as one.
Another is through instruction related to this libreoffice help article: https://help.libreoffice.org/Calc/Ce...urrency_Format
Though the cells may initially be in text or general format and need to be changed to a currency format.
Or by way of "equation" to build/rebuild the values through some sort of operation(s) like find and replace on the column.

Presumably though this is something you'd like to automate rather than have to manipulate on each such transfer. To accomplish that and not to disrupt the normal export process, a new field would be needed in the export file. That is accomplished by "adding" a field to the filelayout for the export type that is to have that field.

Then at some point after the price has been collected from the database, the field for the associated record would need to be "built" to contain your desired text. I don't know if you would be trying to export in every currency supported by the store or just the default currency, but for each such field, would need a filelayout field.

The currency could/would be exported using the $currencies variable/class which is declared in the easypopulate_4.php file. The currency class offers output "modules" to support providing the string version of the currency. Some manipulation may be necessary to append the three letter representation of the currency, but it is all something doable for any of the exports that offer the price of the product.