To better assist you, please include more specific details about what you are trying to achieve.
It will introduce brake-points and columns under it.
Bear in mind though, some editors can't know what these breakpoints mean and how they will turn out. So presets are ALWAYS useful. Just try and make only those that are really needed and try and see if you can get some grids into blocks (templates)!
Let us know in this thread when you've made a PR on GitHub.
About this: "Bear in mind though, some editors can't know what these breakpoints mean and how they will turn out" >> well that's really the job of the grid system - foundation, bootstrap or whatever. So when you chose one, you now for what you are going.
There is a row and then column:
Foundation: row >> small-2 large-4
Bootstrap: row >>col-xs-2 col-lg-4
Bulma: columns >> is-three-quarters ...
So all that needs to be done, is settings something like $brakepoints => 'xs' => 'col-xs-1', 'col-xs-2'..., 'lg' => 'col-lg-1', 'col-lg-2'..., to according grid config and small logic (and ui) that work with that. The end result would be something class="col-lg-4 col-md-2". Or how precise the editor want's. If no brake-points added to gird config, the current logic kicks in.