Mostly, Gallery and Forms are used to work with CDS (Common Data Service) Entities data are in Dynamics 365 like Accounts, Contacts, Opportunities etc.
Some of the common field level metadata info you can retrieve is: MinValue, MaxValue, MaxLength of a field. This is dependent on whether it is supported/provided by Data Source itself, be it CDS or any other Data Source, depends.
You can…
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Get Dynamics 365 field metadata in a Canvas App using DataSourceInfo function | Common Data Service – D365 Demystified
Here’s how you can enhance CDS connected Form by showing some Dynamics 365 field metadata in your Canvas Power!
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