I did a quick sketch and it looks like if you have a 90deg v-bit all you have to do is tell Easel that your bit is twice as wide as your chamfer leg and your depth of cut is also the length of your chamfer leg. For example if you want a chamfer that’s 1/8" x 1/8" you would tell Easel you’re using a 1/4" bit, your depth of cut would be at 1/8" and you would cut on the path. See diagram below.
With this logic, if you want a 1/4" x 1/4" chamfer your bit would be 1/2" at a depth of 1/4" on the path.
I haven’t tried this, but I couldn’t see why it wouldn’t work!