At least in some instances you could frame it that way: You believe that doctors and medicine are effective at treating disease, so when you are sick and a doctor gives you a bottle of sugar pills and you take them, you now interpret your state through the lens that you should feel better. A bias on how you perceive your condition

That's not all that the placebo effect is. But it's probably the aspect that best fits the framing as bias

It's much more than a bias.

You actually get better through placebo, as long as there's a pathway to it that is available to your body.

It's a really weird effect.

The fight isn't against triggering placebo, it's against letting it muddle study results.