Creating multi-valued index on json column

[Nenad M]

Hello,

I have table components with json data column.
Here in data column i am expecting to have: {"products": ["a", "b", "c"...]}

I noticed that in MySQL 8.0.17 it is added support for adding multi-values index on json column. In this particular case i want to add index like:

CREATE INDEX products ON components ( (CAST(data->'$.products' AS VARCHAR(255) ARRAY)) );

but it gives me error.
On this link https://dev.mysql.com/doc/refman/8.0/en/create-index.html i found way how to create index for unsigned int type:
CREATE INDEX zips ON customers ( (CAST(custinfo->'$.zip' AS UNSIGNED ARRAY)) );

Is there a way to accomplish the same and create index on json array of strings?