dfr lit for expression> dfr lit {flags} (literal)
literal: literal to construct the expression| input | output | 
|---|---|
| any | any | 
Created a literal expression and converts it to a nu object
>dfr lit2|dfr into-nu
╭───────┬─────────╮
│expr│literal│
│value│2│
╰───────┴─────────╯
Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag
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    https://www.nushell.sh/commands/docs/dfr_lit.html