I'm working on Rails's html.erb file, after a lot of fiddling I'm finally figured out how to make intellisense autosuggestion works. The problem is it currently works with this class = "" pattern

but not class: "" pattern
which is the way to define class in ERB <% %> tag
I'm currently using SCSS Everywhere extension and have tried HTML CSS Support. They behaved the same.
So TLDR;
Want intellisense to work on class: "..." pattern but seems to only work on class="..." pattern. Is there a setting ( global/extension level, global level preferred) to define this, or are there an already well-known fix I'm not aware of?