engine.addFact('ref.insurance', (params, almanac) => {
 return almanac.factValue('ref.insurances')
 .then(insurances => {
 let insurances_array = insurances.filter(insurance => insurance.health_insurance_code === '250')
 
 console.log(insurances_array.length) //===> can be 0,1 or n
 return insurances_array;
 })
 })

 conditions: {
 all: [
 { 
 fact: 'ref.insurance',
 operator: 'in',
 value: ["250","55","33","44","55","11"],
 path: '$.health_insurance_code'
 }
 ]
 },

[
 {
 "ref": 
 {
 "family": 
 {
 "record_type": "F",
 },
 "member": 
 {
 "record_type": "M",
 },
 "household": 
 {
 "record_type": "O",
 },
 "insurances": [
 {
 "record_type": "I",
 "health_insurance_code": "250",
 },
 {
 "record_type": "I",
 "health_insurance_code": "250",
 }
 ]
 }
 },
 {
 "ref": 
 {
 "family": 
 {
 "record_type": "F",
 },
 "member": 
 {
 "record_type": "M",
 },
 "household": 
 {
 "record_type": "O",
 },
 "insurances": [
 {
 "record_type": "I",
 "health_insurance_code": "250",
 }
 ]
 }
 }
 }
]