Hey @slycrespo2!
If you intend for this to only work in level, what you are looking for is blueprint communication. You will need a variable that can be updated with a function (number of coins) and of course your widget counter. Here is a non-Epic affiliated tutorial on blueprint communication through setting up a health bar that is the exact same concepts:
Total coins overall is similar but will require a persistent variable that transfers over all levels.
I hope the above solution works for you!