Custom column formatting supported schemes

In a list, I'm trying to customize a column to render an hyperling that use a data: scheme (3rd party app will handle interpretation) :

{ "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json", "elmType": "a", "txtContent": "@currentField", "attributes": { "target": "_blank", "href": "='data:text/plain;charset=utf-8,my field as text :' + @currentField" } } 

However, this does not works (fields renders as simple text).

Is it possible to use such url scheme ?

I'm aware I could build a field customizer, but it's a bit more complex to deploy.

Also tried :

{ "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json", "elmType": "a", "txtContent": "@currentField", "attributes": { "target": "_blank", "href": { "operator": "+", "operands": [ "data:text/plain;charset=utf-8", "my field as text :", "@currentField" ], "data-interception": "on" } } }