How to implement grouping in handlebarsjs?

Question

JSON

Good evening, tell me how to implement data grouping?
I derive such a structure with a template engine

how to group data under one date?
So that all goods would go under one number, and not duplicate 6 times.
There is an excellent plugin https://github.com/shannonmoeller/handlebars-group-by but it does not work, although maybe I could not run it, it constantly gives the error Missing helper: "group