Service to var.set a mapping attribute

[GaPhi]

The current service only allows string as an attribute value.

I need to set a mapping, which seems possible using the developers tools must is rejected by the service call.
template value should be a string for dictionary value @ data['attributes']['my_attribute']

Is is possible to update the service call to allow any attribute value type ?
It would be easier to use (today I transform the data in a JSON string to store it, and need to parse it when reading it again)

Thanks !

[snarky-snark]

Attribute values are template strings which can evaluate to non-string values.

[snarky-snark]

https://www.home-assistant.io/docs/configuration/templating/