Yes, it is possible
That's what the Align tag was created for
Align can be used by any user able to use UBBCode
And this is how it's done:
[align:center]Yes, it is possible[/align]
[align:right]That's what the Align tag was created for[/align]
[align:left]Align can be used by any user able to use UBBCode[/align]