Chosen JS multiple dropdown values set

I have job form where i have implemented chosen js to select multiple options from dropdown the issue is when i come for edit then i want to set that dropdown field as selected i have saved values which are saved on creating time in db i will show you comma saparated values you have to fix this issue on those 2 dropdowns which i have already implemented. you need to make sure it should not affect existing other fields functionalities. and it should work 100% i mean whole form after you made changes. i can't provide project because it has lot of configurations you need to work remotely. my budget is 500INR for this. i am using this plugin <script src="[login to view URL]"></script>