edit table and add new index key with forge

Hi,

i'm using CI4 and db migration, when i create the table i can create the index at the same time, it worked perfectly, but when i try to edit the table and try to create the index with forge, it's not working, or the dbforge doesn't had the method that allow us to create the index. Do we have anyway to create the index of a field when editing table with forge ( just like laravel does )