GetAddress.io API Script Modification

I am trying to get the output of line_1 line_2 and line_3 all on the same field called "address" instead of them all being on there own input field.

I am using the API from getAddress.io and the code i am using is below, i have tried to the best of my knowledge and hitting my head against the wall and need some assistance from the professionals :)

At the moment using that code is shows address like below:

Line 1: Flat 14 Line 2: Linden Court Line 3: Main Street

What i am trying to do is get the output on the same line like below:

Address: Flat 14, Linden Court, Main Street

$('#postcode_lookup').getAddress({
api_key: 'MYAPIKEY',
output_fields: {
line_1: '#address',
line_2: '#line2',
line_3: '#line3',
post_town: '#town',
county: '#county',
postcode: '#postcode'
},
onAddressSelected: function(elem, index) {
let postcode = $('#getaddress_input').val();
$('#postcode').val(postcode.toUpperCase());
}
});

All the information i have about this can be found direct on there website at https://getaddress.io/Documentation