[Rails] XML builder

I am using the XML builder and I am frustrated by the lack of being
able to use variables to define the names of XML elements

I want to be able to do this (in actionname.xml.builder)
...
element_name = "Tag"
xml.element_name("Brandon")
...

ACTUAL OUTPUT
...
<element_name>Brandon</element_name>
...

DESIRED OUTPUT
...
<Tag>Brandon</Tag>
...

Does anyone know how I could achieve the desired output using only the
xml builder?

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