I used to do stained glass artwork but haven’t had the tools out in a long time. Part of that hobby could have involved etching glass but I never got into it. Etching glass kits were available at one time in craft stores like Michaels. I haven’t been in one in awhile so they still might. If not, try looking for some hydrofluoric (HF) acid. Apparently it does a nice job of etching glass but it is a strong acid so be careful and take all the necessary precautions.