Update a cell by adding other record without replacing it

Please help me its urgent. I only wanted to update a cell by adding (appending) new value to it to make it like the picture I provided, but it is replacing the previous cell value here is my code that updates.
base(‘Participant Score’).update([
{
“id”: “recZbJYK8KPYZcIdI”,
“fields”: {
“Score”: [
“recvwoc3tOqfdjXUk”,
“rec0CRNPStI5JI0zN”
]
}
}], function (err, records) {
if (err) {
console.error(err);
return;
}
records.forEach(function (record) {
res.status(201).send(record)
});
})