@Mike Nanto Thanks for reaching out. I am not sure of the output format you are looking for. But here is sample liquid template I have created for your scenario.
[
{%- for record in items -%}
{"id": {{record.id}} ,
"number": {{record.number}}} {% unless forloop.last %},{% endunless -%}
{%- endfor -%}
]
Resultant output for provided output:
To test your liquid templates, you can use this playground.