Hi Adriano,
Sorry it is not an issue. Kindly use the below code example to render Tab with template option for header and content.
<ejs-tab>
<e-tabitems>
<e-tabitem>
<ng-template #headerText>
Twitter
</ng-template>
<ng-template #content>
Twitter is an online social networking service that enables users to send and read short 140-character messages called "tweets".
</ng-template>
</e-tabitem>
<e-tabitem>
<ng-template #headerText>
FaceBook
</ng-template>
<ng-template #content>
Facebook is an online social networking service headquartered in Menlo Park, California.
</ng-template>
</e-tabitem>
</e-tabitems>
</ejs-tab>
Regards,
Karthi