Want to convert multiple values of single key into array

I have an array which contains multiple values on single key. Now want to convert those values into nested array. Please help me with this.
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Welcome to the Make community!

Every result (item/record) from a iterator/search/match module will output a bundle. To “combine” them into a single structure, you’ll need to use an aggregator of some sort.

Aggregators are modules that accumulate multiple bundles into one single bundle. An example of a commonly-used aggregator module is the Array aggregator module. The next popular aggregator is the Text Aggregator which is very flexible and has applies to many use-cases.

There are other types of aggregator modules, click the below links to find out more:

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