Blog post -https://www.jitendrazaa.com/blog/salesforce/gravatar-reusable-lightning-web-component/

gravatar.js-meta.xml

<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>48.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__AppPage</target>
        <target>lightning__RecordPage</target>
        <target>lightning__HomePage</target>
        <target>lightningCommunity__Page</target>
        <target>lightningCommunity__Default</target>
    </targets>
        <targetConfigs>
            <targetConfig targets="lightning__RecordPage,lightning__AppPage,lightningCommunity__Default">
                <property name="size" type="Integer" label="Size of image in pixel" /> 
                <property name="email" type="String" label="Email address of profile" /> 
                <property name="isRoundCorner" type="Boolean" default="true" label="Should gravatar rendered as rounded image ?" /> 
            </targetConfig> 
        </targetConfigs>   
</LightningComponentBundle>