@wismanni Currently, it is not possible to separate each time group with a new line.
There is a class for group-2 and group-3 for two and three sets of opening hours already in place, but there’s limited possibilities in styling this as you’d like – because the time groups are not enclosed in a HTML tag.
I will be adding a new structure in an upcoming release, likely to be the next one. This will extend the list version to have each time group in a sub list – so, you can format it appropriately, including the appearance of a new line by styling each of the <li> as a block (for example).