@Marcegon in doing this you’d need to use the ToString() function with the thousand separators argument set to 1 (=Yes). Unfortunately, in doing so, you’ll lose the numeric data type but this is the only way currently. In terms of aligning to the right, this is something you’d need to do in a Table tool, where you can click on a field and set its alignment. When outputting the table tool you’d then need a Render tool instead of a standard Output Data tool.
Edit: I hadn't previously realised that the Table tool will automatically format numbers with thousand separators and so you can just plug your number straight into it and set the decimals to 0:
