Add a variable to wp_enqueue_script script url

I have added the function to enqueue the script and it worked perfectly this way

wp_enqueue_script( ‘google-map’, ‘https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap‘, array(), ‘3.0’, true );

How to replace the “YOUR_API_KEY” with a variable $key.
The $key is an option in the wordpress theme options that appears properly. when I echo $key;

Please help me to get this sorted.

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