Merge videos with Adobe Premiere

Hello

You need to know and use Adobe PREMIERE version 2021 minimum

I need the following :
- Intro video needs to be added in the beginning and chang the text inside this opener
- Merge a total of 40 videos (each video has around 4/5 videos + intro video)

Deliverables:
- Merged video in .mkv format in each folder
- Adobe Premiere Source file

Thank you

please send references