How to include custom plain js file

I have old js & css files that I have worked on old web app with html, js, css.
I want to add this page in my vue& app.
file structures are following…

libs->mylib.js, mychart.js, …
js → general.js

How can i add these files in my vue & nuxt app?
I tried to add this code in myapp.vue

<script src="../assets/libs/mylib.js"></script>
<script src="../assets/js/general.js"></script>

but i doesnt work well.
can you help me?

all of js files include the jquery function and Pure functions in JavaScript

Here are some solutions to this: