espocrm-base/application/Espo/Modules/Crm/Resources/metadata/clientDefs/Target.json

{
   "controller": "controllers/record",
   "views":{
      "detail":"Crm:Target.Detail"
   },
   "menu":{
      "detail":{
         "buttons":[
            {
               "label":"Convert to Lead",
               "action":"convertToLead",
               "acl":"edit"
            }
         ]
      }
   },
    "boolFilterList": ["onlyMy"]
}