Array inside an array in request

I have a multiple select box in blade that I send to controller without any problem. I am trying to add dynamically more multiple select boxes via JavaScript. What is the correct syntax to achieve that?

My current code:

<select multiple="multiple" name="categories[]" class="full-width select2-hidden-accessible select2-multi" data-placeholder="Select Categories" data-init-plugin="select2" tabindex="-1">

What I want to make:

<select multiple="multiple" name="businesses[1][categories[]]" class="full-width select2-hidden-accessible select2-multi" data-placeholder="Select Categories" data-init-plugin="select2" tabindex="-1">

via Chebli Mohamed