Transition of UI Object from random animation frame to a new a animation

Hi =)

I've been searching for a while and haven't found this problem, if there is already a thread about it I'll greatly appreciate the link. I'll try to describe my problem to the best of my abilities.

I have two animations in an Animator for a given Unity UI 2D object, and they both run well on their own. However, I would like to not set an initial keyframe for the second animation (I'm doing so right now and starting at the final point of the previous animation), as I wanted to start from where the previous animation ended and considering that the previous animation can end at any point via a trigger or something similar.

For example, if I'm scaling from 0 to 1 an object I want to be able to implement the scaling from any point between 0-1 back to 0. This way, the second animation could either start from a scale from .12 or .2 or any other point in which the trigger is activated. If you could provide me help with this particular issue I'll greatly appreciate it.