Handling the timer itself is actually something you are supposed to do on game side - the plugin has the interface you can use to proceed in the dialogue and you can do that the way you want.
If you want to setup a float value for the nodes with the exact timing there are two way I can think of doing that:
1.) The easy one: use a float class variable inside your player character. Then you can just use the set float class variable event to set it’s value for each node. (Easy, because you don’t have to modify the plugin, but bad, because it won’t be that comfortable to work with).
2.) Modify the plugin and add a float variable to the nodes - it’s pretty easy to do, you can follow some other node variables and copy paste code to generate the same result.
If you wish to go with the second option I can give you a more detailed description about it - or just join our discord, and ask for help there - we had at least two different people who already did something similar.