I'm trying to see if I could use the I2C protocol to be able to read a potentiometer connected through an ADC that is connected through I2C with the microcontroller.
Yes you can do that.
ADS1115/1015 or similar module are commonly available and suitable for that.
There is an Adafruit library for those modules. Suggest you begin with one of the example sketches that come installed with that library.
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