Add multiple animations to final animation pose?

Hello. While I was working on another weapon in my game, I ran into a giant problem. I have an ironsight rifle animation, with a blend pose on it, so when that animation plays, you can look up and down. The problem is, you can only plug in one animation to the blend, and I want to also plug in my pistol holding animation. Right now, when you hold the pistol, your spine doesn’t rotate when going up / down. How would I fix this?

In the image, you can see how you can only plug in one animation to the local component, and I want to do multiple.

Thank you if you know how to fix this, and please respond if you have an answer!