How to declare sightly java classes globally and include/use their references in all html files?

When we declare/instantiate a java class in htl/sightly in a html (similar to global.jsp) file and include it in another html, we are not able to access the reference of java class created in the included file.
For Ex:
Create a java class that extends WCMUse with some getters.

com.company.sightly.components.WcmUseSample.java

public Map<String,String> getMyHashMap() {
return myHashMap;
}

Declare/instantiate the java class in htl in a html file (similar to global.jsp)
i18n-template.html
<div data-sly-use.myClass="com.company.sightly.components.WcmUseSample" data-sly-unwrap></div>

Include it in another html and try to access the reference of java class in this html.
content.html
<div data-sly-include="i18n-template.html" data-sly-unwrap></div>
${myClass.getMyHashMap['lastpage']}

We tried many options but didn't work. Few of them are:
<div data-sly-include="i18n-template.html" data-sly-unwrap></div>

<sly data-sly-include="i18n-template.html" data-sly-unwrap></sly>

<div w3-include-html="i18n-template.html"></div>

<section data-sly-include="i18n-template.html"></section>

<section data-sly-include="${ @ path='i18n-template.html'}"></section>

<section data-sly-include="${'i18n-template.html' @ prependPath=''}"></section>

<section data-sly-include="${'' @ appendPath='i18n-template.html'}"></section>
...

Please let us know how we can achieve this. Any help would be greatly appreciated.

Thanks,

Mohan