How to get the variable from Firebase storage in construct 2

I use rex_item table to save the key and value the I take the value using load action in rex_item table

But I won't know how to get the data from Firebase storage so please help me to take the data from Thier into my game. (__Not from database from the firebase storage__)

For example if I store some variable in Firebase then the game can read the data from Thier and keep updating themself

If I change the value of var in the storage then the game will take the value from that var in the firebase storage and update themself