On RubyMine 97.73 I defined my own live template:
= f.label :$FIELD$
= f.text_area :$FIELD$
expand with default
Context: 'Other' and 'haml' (Other was the context when I ran Tools -> Save as live template)
when I type field<tab> in a haml file nothing 'live templaty' happens (just the tab)
I tried different combinations of abbreviate / context / expand with without luck.