Building my API documentation with Postman - question about string lengths

I’m using Postman to build my API documentation. I’ve got all my POST and GET’s there with my field lists and data types.

I’m kind of stuck on the datatype. When building database tables we define some fields as strings but we also put a length on them. When people are developing their APIs is it not standard practice to show the string length in the POST definitions?

For my POST’s this is what is showing for my field lists:

“LAB_CODE”: “”,
“TEXT”: “”

Am I missing something?