Welcome to the community 
You can definitely etch into it using a marking spray, there are quite a few designed just for that - but most of our metal posts on here are about the 40W CO2 lasers, and yours is a Diode laser.
SO! You may get to add to our knowledge! Folks here have discovered everything from vinegar to a wet paper towel can work!
Some marking sprays:
https://www.amazon.com/OMTech-Laser-Marking-Spray-Metal/dp/B09L4GDCN9
Whatever you end up using, be sure to search for “diode” aluminum marking spray.