if i well understand what you have says. you want to have the selected choise from the selection datatype.
try this code:
{$node.data_map.name_of__your_attribute.content.0}
use $node if you are in an override template.
i think this could help you.
The theory is when we know everything and nothing works.
The practice is when everything works and nobody knows why.
If the practice and theory are met, nothing works and we do not know why.
