Multiselect checkboxes

Hi,
Could you tell me how to render multiple-choice checkboxes ?

I have a structure like below:

{
"letters":{
"type":"array",
"items":{
"type":"string",
"enum":["A","B","C"]
},
"uniqueItems":"true"
}
}

[original thread by j-zimnowoda]

Hi. Thanks for your interest in JSON Forms! A similar question was previously answered, so please see this answer for more information.

[j-zimnowoda]

Thanks for quick response.
Then I will write my own renderer.