The Angular version of a Bootstrap Popover component is described at https://ng-bootstrap.github.io/#/components/popover/examples . The example used for using using HTML in the popover is:
<ng-template #popContent>Hello, <b>{{name}}</b>!</ng-template>
This is fine if you are specifying the HTML formatting in the HTML, but doesn't work if you are providing the HTML from a TypeScript method, for example to import it from a server:
<ng-template #popContent>{{getMyHtmlFromTheServer()}}</ng-template>
The HTML code shows up in the popover. It would be good if the documentation gave such an example.