Field length formatting

Hello, 

I am new to Freemarker and I am trying to output a value in a predefined
length format, in particular have Freemarker add trailing spaces to meet a
specified string length. E.g. value 'Foo' should become '            Foo'
when specifying a length of 15. 

Does Freemarker provide in such a method/function?

I was able to create a macro that does the trick, but I am curious if such a
function exists already in the framework.

<#macro format size><#local nestedContent><#nested></#local><#if size gt
nestedContent?length><#list 1..size - nestedContent?length as n>
</#list><#nested><#else><#nested></#if></#macro>

Usage: <@format size=15>Foo</@format>

Thanks,
Kjeld 
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