Converting a Text Symbol String to a Hex string

Hello, 

I have a string constant which reads a character of 0 and I want to convert this to a hexadecimal string of 30.

I tried to achieve that by using the "Format Value" function. I believe the conversion needs to see the string as a text symbol rather than a number but I couldn't find this conversion option available in the String functions library.

I only need to achieve this for one string value at a time. I was hoping that it would be achievable with the use of a function rather than using a LUT. 

Would appreciate any feedback you may have. 

Many Thanks