Testing Carbon Fields which seems like a nice free and code-first alternative to ACF. Posted demo on using Timber for rendering here htmlburger/carbon-fields#1252.

Simply running Timber::render in CF set_render_callback seems to work (full code in linked example) eg.

...

->set_render_callback( function ( $fields, $attributes, $inner_blocks ) {
  $context = Timber::context();
  $context['fields'] = $fields;
  $context['attributes'] = $attributes;

  echo Timber::render('crb-timber-block.twig', $context);

...

Trying to understand if this is ideal however, eg. if Timber::render is the correct function (enqueues assets etc?), or would something more "partial rendering oriented" be more suitable (eg. work in progress stuff here #2944).

I am using the block also in context of a theme made with Timber starter template which also calls Timber::render.