Document how to migrate ECK entities from one Drupal instance to another

I'm not sure about the source part of the migration yml, I've never done a migration from one D8+ site to another. But there's probably a base entity source plugin available somewhere if you dig around in the "migrate" directory.

Use something like this for the migration yml file's destination:

destination:
  plugin: 'entity:NAMEOFECKENTITYTYPE'
  translations: false
  default_bundle: NAMEOFECKBUNDLE

Hope that helps.

Hi @ DamienMcKenna, thank so much for your response.! So in order to make the picture clearer, this is what I'm using to get migrations work from an old D.8.5 to D.10.x in this case, hoping we can improve the documentation.
1.- Install: Migrate
2.- Install: Migrate Plus
3.- Install: Migrate Tools
4.- Install: Drupal 8+ migration (source) - (Which is supposed to connect content from external databases at this time)

Technically speaking "migrate_drupal_d8" does offer a plugin (d8_entity) to import any entities from D8+ (Tried it before with migrations from D8 to D9 https://antrecu.com/blog/how-migrate-drupal-8-drupal-9 ) when creating .yml files and it works great. But when it comes to ECK migrations from D.8.x, D.9.X to D.10.x it just won't recognize any of the available options for ECK apparently.