'How set API key from signing.properties to index.html

To use Google Maps for web I need set API key as

<script src="https://maps.googleapis.com/maps/api/js?key=API_KEY"></script>

For Android I am using this technique showed in this thead: How to manage signing keystore in Gitlab CI for android

How can I get the Google Maps API key from signing.properties and set in index.html?



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