To fetch plugin page content on First level page

The CMS Questions
1

Hello @texnixe,
Can we fetch plugin page content in side first evel page or in side default site page? As I have created a plugin and fetch there data from mysql database and implemented design with css there. So I want that that should be a first level page like site, users etc.

Thanks

2

Define “first level page”, please.

Also, some more context would be helpful.