Tell me how to correctly add values ​to display in the table - salesforce

Question

I have such an object
the "from" field and the "to" field are responsible for the date (shows the value for the selected date period).
the currency field shows the default currency from which other currencies are converted.
field enter currency - (my test field which is not needed yet).
field value is the value of my currency.
my currencies are stored in Manage Currencies
I want to use as many currencies as possible
but I don't know how to do it right because if I continue to add currencies through Manage Currencies, I will have to correct the code as well, because my table filling looks like this:
<template if:true={data}>
<lightning-datatable
key-field="id"
hide-checkbox-column
data={data}
columns={columns}>
</lightning-datatable>
</template>
____________________________________________________________
#track columns = [
{ label: 'Date', fieldName: 'key'},
{ label: 'USD', fieldName: 'USD', type: 'currency' },
{ label: 'CAD', fieldName: 'CAD', type: 'currency' },
{ label: 'EUR', fieldName: 'EUR', type: 'currency' },
{ label: 'GBP', fieldName: 'GBP', type: 'currency' },
{ label: 'KZT', fieldName: 'KZT', type: 'currency' },
{ label: 'BYN', fieldName: 'BYN', type: 'currency' },
];
getExchangeRates({baseCurrency : this.defaultCurrency, dateFrom : this.dateFrom, dateTo : this.dateTo, value : this.defaultValueSelectedCurrency})
.then(resultJSON => {
let result = JSON.parse(resultJSON);
let recordsByDates = result.rates;
console.log('Test result 2');
console.log(recordsByDates);
this.data = [];
for (var key in recordsByDates) {
let record = {
key: key,
date : recordsByDates[key].date,
USD : recordsByDates[key].USD,
CAD : recordsByDates[key].CAD,
EUR : recordsByDates[key].EUR,
GBP : recordsByDates[key].GBP,
BYN : recordsByDates[key].BYN,
KZT : recordsByDates[key].KZT
}
this.data.push(record);
}
console.log(record);
console.log(this.data);
})
.catch(error => {
this.error = error;
console.log(error);
});
and it will look terrible: