How can I import data from XML into a content type using the Migrate module?

As Kevin suggested, inspired by the

migrate_plus.migration.wine_role_xml.yml

file from the migrate_plus module , i have managed to make it working as such:

id: beetween_jobs
label: 'Migrate beetween jobs from XML file'
migration_group: default
source:
  # We use the XML data parser plugin.
  plugin: url
  data_fetcher_plugin: http
  data_parser_plugin: xml
  # Normally, this is one or more fully-qualified URLs or file paths. Because
  # we can't hardcode your local URL, we provide a relative path here which
  # hook_install() will rewrite to a full URL for the current site.
  urls:
    - https://my_website/files/ressources_docs/beetween.xml
  # Visit the URL above (relative to your site root) and look at it. You can see
  # that <response> is the outer element, and each item we want to import is a
  # <position> element. The item_xpath value is the xpath to use to query the
  # desired elements.
  item_selector: /root/job
  # Under 'fields', we list the data items to be imported. The first level keys
  # are the source field names we want to populate (the names to be used as
  # sources in the process configuration below). For each field we're importing,
  # we provide a label (optional - this is for display in migration tools) and
  # an xpath for retrieving that value. It's important to note that this xpath
  # is relative to the elements retrieved by item_xpath.
  fields:
    -
      name: title
      label: 'title'
      selector: title
    -
      name: diffusion
      label: 'diffusion'
      selector: diffusion
  # Under 'ids', we identify source fields populated above which will uniquely
  # identify each imported item. The 'type' makes sure the migration map table
  # uses the proper schema type for stored the IDs.
  ids:
    title:
      type: string
process:
  # Note that the source field names here (machine_name and friendly_name) were
  # defined by the 'fields' configuration for the source plugin above.
  title: title
  field_diffusion: diffusion
destination:
  plugin: 'entity:node'
  default_bundle: job
migration_dependencies:
  required: {  }
  optional: {  }