I've seen a component in Element UI for managing the amount of items, it's over here:
https://element.eleme.io/#/en-US/component/input-number
I would want to use something like that in Vuetify, but I cannot find a similar component or even similar style example in Material Design. What's the best way to achieve it?
Yes there is:
<v-text-field
v-model="numberValue"
hide-details
single-line
type="number"
/>
Check out slider component docs for a working example.