Using `StringTemplateTrait` to build templates

I have a helper that defines the time template like this:

protected array $_defaultConfig = [
    'templates' => [
`        'time' => '<time{{attrs}}><i class="far fa-clock fa-sm fa-fw"></i> {{text}}</time>',
    ],
];

So I have the time() method:

public function time(string $text, array $options = []): string
{
    $attrs = $this->templater()->formatAttributes(options: $options, exclude: ['icon']);

    return $this->formatTemplate(name: 'time', data: compact('attrs', 'text'));
}

So far, everything works fine. For example, with:

$this->Helper->time(text: '5 days ago');

output:

<time><i class="far fa-clock fa-sm fa-fw"></i> 5 days ago</time>

Now I would like to understand how I can modify the template (and possibly add variables to it) using the $options argument, so in the single method call (let's say "inline", then).

For example:

$this->Helper->time(
    text: '5 days ago',
    options: [
        'templates' => ['time' => '<span{{attrs}}><i class="far fa-clock fa-sm fa-fw"></i> {{text}} - {{subtext}}</span>'],
        'templateVars' => ['subtext' => 'Another text'],
    ]
);

As usual, I get nothing (in fact, I should also exclude these options for formatAttributes()).

I understand that I need to somehow update the template and parse the new variables into my method, but I can't find any documentation on this.

I currently find it works like this here:

public function time(string $text, array $options = []): string
{
    $options += [
        'templateVars' => []
    ];

    if (isset($options['templates']['time'])) {
        $this->setTemplates(['time' => $options['templates']['time']]);
    } else {
        $this->setTemplates(['time' => $this->getConfig('templates.time')]);
    }

    $attrs = $this->templater()->formatAttributes(options: $options, exclude: ['icon', 'templates']);

    return $this->formatTemplate(name: 'time', data: compact('attrs', 'text') + $options['templateVars']);
}

I wonder if it is correct and reasonable, maybe it is, but it doesn't seem like much to me. Of course here I have to call the setTemplates() method even when $options['templates']['time'] is not present, to reset the default template (otherwise subsequent calls to the method will continue to use the updated one).

So I ask for some useful information, including some examples from some existing helper or documentation (which I didn't find). Thanks.

(obviously the one exposed is an example case, otherwise I would be quicker to use the tag() method of HtmlHelper)