how to use ec_custom_field with a value composed of an array


I have the following order key which its value is composed of an array

"key": "_wccf_cf_source",
"value": {
"1": "google"

When I call this key with [ec_custom_field key="_wccf_cf_source" show="value"], the result shows "Array".
My goal is to get "google" based on this example.
And I don't know how to do that.

I tried to replace show"value" by show"value(1)" and by show"value{1}"  or show"value[1]" but it's not working.

Could you help me on this ?
By the way, has the plugin been abandoned ?

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