How to use the "in" operator in the traffic-split plugin?

[scaat]

How to configure the in operator?

"match": [
    {
        "vars": [
            ["http_release","in", ???]
        ]
    }
],

[tzssangglass]

example: https://github.com/api7/lua-resty-expr/blob/main/t/v1/sanity.t#L269-L292

[scaat]

"match": [
    {
        "vars": [
            ["http_release","in", {'1','2'}]
        ]
    }
],

is that? but this is not json format. @tzssangglass

[tzssangglass]

"vars":[
    [
        "http_release", "in", [ "1", "2"]
    ]
]