with htmx you can send out of band content down that will be swapped in by id:

https://htmx.org/attributes/hx-swap-oob/

you can also select content by a selector:

https://htmx.org/attributes/hx-select/

and there is infrastructure for general response transformations via the extensions mechanism:

https://htmx.org/extensions/client-side-templates/

See the source code here:

https://unpkg.com/[email protected]/dist/ext/client-side-templa...