so that an ad-hoc instance of template engine will be created, used and dumped.
targets
- a.output: a.my_new_engine
- output: b.output
template: b.unknown
template_type: my_new_engine
- output: c.output # this will create ad-hoc jinja2 engine, and get dumped after the op.
template: c.alien
template_type:
- overrides: jinja2
- options:
..
block_end_string: '*))'
...
#202