How to maintain different path in terraform backend by using terragrunt how to config backend by terragrunt

I need to store state files for different accounts in different paths in single bucket in s3 by not hardcoding the values i need to give dynamically from app.

I saw some solutions regarding terragrunt but I dont know how to pass the different path for s3 backend dynamically.

I saw some solutions regarding CLI -config from CLI and terraform -reconfig but I need from UI.

I will put the repo in one place every time i need to pass the values from app dynamically.

Please suggest me some solutions regarding this.Need some examples how we will achieve this in terragrunt.

Thanks in advance.