I have a question. Why is the particle に instead of は for this sentence? Isnt the one doing supposed to be は not に? Thank you


I have a question. Why is the particle に instead of は for this sentence?
“私に何かできることがあれば” Isnt the one doing supposed to be は not に? Thank you [![enter
image description
here](https://i.stack.imgur.com/5NBCt.jpg)](https://i.stack.imgur.com/5NBCt.jpg)

