{% set base = {"a": 1, "b": 2} %}
{% set other = {"c": 3} %}
Simple spread: {{ {...base} | safe }}
Add key: {{ {...base, "d": 4} | safe }}
Multiple spreads: {{ {...base, ...other} | safe }}
Override: {{ {...base, "a": 99} | safe }}
{% set base1 = {"a": 1, "b": 2} %}
{% set base2 = {"a": 3, "b": 4} %}
Override 2: {{ {...base1,...base2} | safe }}
Interleaved: {{ {"x": 0, ...base, "y": 9} | safe }}
{% set empty = {} %}
Empty spread: {{ {...empty} | safe }}