How to get values from database in custom element

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If you wish to pass an array or an object. do something like this:

//page code
let array= ['some array'];
$w('#customelement').setAttribute('attribute-name',JSON.stringify(array));

//custom code attribute change hook:
if(name === 'attribute-name'){
const value = JSON.parse(newValue);
//continue from here with the value
}