How do i reference “distributeLeadshandler.js” in a button in "Leads.json"

[macMonkey]

According to the file structure in the picture, how can i refer “distributeLeadshandler.js” as the handler in the “Leads.json” code:

{
"menu": {
"list": {
"buttons": [
"__APPEND__",
{
"label": "Distribute Leads",
"name": "distributeLeadsButton",
"action": "distributeLeads",
"style": "default",
"acl": "edit",
"aclScope": "User",
"handler": “custom:distributeLeadshandler",
"actionFunction": "openDistributeSlider"
}
]
}
}
}

[Kharg]

The handler location is not custom: but lead-manipulation-package:distributeLeadshandler same for the .js module