Custom Message string

Hello,

I was wondering if there is a possibility to send a custom message that contains variable string, or if there is a smarter solution than me deconstructing the string into chars and sending them one by one?

As I always get FastWriter Errors when trying to send a string and supposedly it is not suited to deserialize strings so I assume it is not supposed to be sent?

Kind Regards

EDIT:
I figured you can set a fixed size for the FastWriter and then it works, but adjusting the size dynamically per string doesnt seem to work with string.Length * sizeof(char)