A good start is a google search such as “fritzing part LED matrix”. This turns up some 8x8 matrix parts but nothing else so it doesn’t look like anyone has made one of these yet. The next step is for you to provide a link to the data sheet for the part you want to use that has the pin out and mechanical dimensions of the device (as they are required to make a part). It likely isn’t a large change from one of the 8x8 rgb parts that are around (if it doesn’t have internal drivers which it looks like most of them do). If you are using one of the ones from Adafruit they may have a fritzing part in their fritzing parts repository. Assuming you are using one of the generic ones from aliexpress or ebay mechanical and connection drawings may be more of a challange (they are typically lacking) and you may have to measure a unit to provide the necessary information.
Peter
