Dokz in the end is just a nextjs plugin, this means that it work with the nextjs existing plugin ecosystem.
To add Seo capabilities you can use the next-seo
package
1npm i next-seo
Here is an example of an mdx page with the title meta tag
1import { NextSeo } from 'next-seo'23<NextSeo4title='Simple Usage Example'5description='A short description goes here.'6/>78# Heading910Proident ea esse elit proident et ea aute dolor.