Please elaborate on what you are looking for.
Most field lengths etc. are dependant on the settings of the company in Financials, not all of these are possible to find via the Api, please give us some examples and we'll see what we can find for you.
I'm still not sure exactly what you are asking for, but some of these values you can find in the Segment Keys(ScreenId=CS202000 in the UI)/Dimensions endpoint via the API.
We would recommend that you get familiar with the UI as well since the API generally behaves in the same way.
If you are not finding what you are looking for, you can write a post in the Ideas part of the forum. Here other users can also vote for your idea, which in turn influences the development teams assesment of it. Please include as much details as you can, preferably also the screenID's from where it is available in the UI as well as screenshots, fieldnames etc.
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