Use animation notifies for better blending between 2 animations

Hello, ue4 community!

I’m making blendspace for character running in different directions and can’t make pretty good result. Character legs always cross in blending between two running directions.
For solving this problem I need to add keys ‘LeftFoot’ and ‘RightFoot’ for every animation. Than I need to make blendspace node to blend ‘LeftFoot’ of RunBackward animation with ‘LeftFoot’ of Run90Degrees animation. But I don’t know how to do it.
Are animation notifies suit for role of keys in blending? May be I’m blind but I can’t find the answer for this question.

Thank you for you attention!