The data in the report cannot be filtered.

Hi
I want to filter down to only "202208" using QueryObject but it doesn't work. By using the way to connect to the data source via Mondrian, do you have a suggestion for me?
Thank you for your help.

Below is my code.
{
"container":"country-export-value-pivot",
"global":{
"localization":"https:\/\/cdn.flexmonster.com\/loc\/th.json"
},
"toolbar":true,
"filters":true,
"beforetoolbarcreated":"customizeToolbar",
"height":600,
"report":{
"dataSource":{
"type":"mondrian",
"dataSourceInfo":"Provider=Mondrian;DataSource=TISTradeExport",
"proxyUrl":"http:\/\/localhost:8080\/jpivot\/xmla",
"catalog":"TRADE",
"cube":"TRADE"
},
"options":{
"readOnly":false,
"filters":true,
"viewType":"charts",
"chart":{
"type":"stacked_column"
}
},
"slice":{
"rows":[
{
"uniqueName":"[MONTH]",
"filter":{
"query":{
"equal":"202208"
}
}
}
],
"columns":[
{
"uniqueName":"[Measures]"
},
{
"uniqueName":"[COUNTRY]"
}
],
"measures":[
{
"uniqueName":"[Measures].[VALUE_THB]",
"format":"thousandsSeparatorComma"
}
]
},
"formats":[
{
"name":"thousandsSeparatorComma",
"thousandsSeparator":","
}
]
}
}