Flow CLI - error: expected value of type `{String: String}

Hello,
In Flow CLI I need input argument in format {String: String}.

In command line:
flow transactions send /…/file.cdc --args-json [’{“type”: “String”, “value”: “test”}’]
With output error:
error: invalid argument at index 0: expected value of type {String: String}

Can you give me example for this argument. I didn’t find how to solve it.
Thank you