Hello, @lucasvda.
I did some research, and apparently, they can be installed using the `pip` command, the one used to install Python packages. Therefore, it should be alright to request their installation as you would with any other Python modules: You can post in the Customer Support section here or send a message in our Discord #support channel saying which packages you would like to be installed.
Though I'd recommend you carefully check the packages that you may request: flask-peewee does not seem to be specifically made for working with databases and is in maintenance-only mode, according to its site. Between it and Flask-SQLAlchemy, the latter seems a better choice.
Please let us know if you have any other questions or need further assistance.