Hi,
We do not have a separate Js version of Metronic 8, but you still can write your js code, just in your components do not include lang="ts" for a script tag.
Also you can try to use our Vue 2 Metronic 7 Js version:
https://preview.keenthemes.com/metronic/vue/demo1/#/dashboard
Keep in mind that it is the old Metronic version and all new features will be included in Metronic 8.