For Django SDK, is functionality similar to blocktrans template tag supported?

Yes. The Native Django SDK supports all functionality found in Django’s i18n tags {% trans %} and {% blocktrans %}, in a unified {% t %} tag. The main difference is that in Native a single-line {% t %} conveniently supports any type of content (literal string, variable, a combination of both, metadata) and you only need to use {% t %} / {% endt %} to mark a multi-line phrase such as:

{% t %}
This phrase
several lines.
{% endt %}