How do I put a hole in my chainsaw bar?
I'm not familiar with that particular bar, so can't tell you anything about that spot. However, if you intend to drill anywhere on the bar a normal drill bit is not only going to fail, it's going to get damaged trying.

If a drill is your only option you need to get a masonry bit and regrind the point to about the same shape and angle as a regular bit. Use an Aluminium Oxide wheel for that. Drill at a slow speed without applying too much force, preferable using plenty of cutting oil because otherwise the tip can easily get hot enough to melt the brazing.

An alternative to drilling is to use a carbide burr in a pencil grinder.