Start with default generated template

templates/field/field--node--uid.html.twig

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+{#
+/**
+ * @file
+ * Theme override for the node user field.
+ *
+ * This is an override of field.html.twig for the node user field. See that
+ * template for documentation about its details and overrides.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing span element.
+ * - items: List of all the field items. Each item contains:
+ *   - attributes: List of HTML attributes for each item.
+ *   - content: The field item content.
+ * - entity_type: The entity type to which the field belongs.
+ * - field_name: The name of the field.
+ * - field_type: The type of the field.
+ * - label_display: The display settings for the label.
+ * - is_inline: If false, display an ordinary field.
+ *   If true, display an inline format, suitable for inside elements such as
+ *   <span>, <h2> and so on.
+ *
+ * @see field.html.twig
+ * @see node_preprocess_field__node()
+ *
+ * @todo Delete as part of https://www.drupal.org/node/3015623
+ */
+#}
+{% if not is_inline %}
+  {% include "field.html.twig" %}
+{% else %}
+{%
+  set classes = [
+    'field',
+    'field--name-' ~ field_name|clean_class,
+    'field--type-' ~ field_type|clean_class,
+    'field--label-' ~ label_display,
+  ]
+%}
+<span{{ attributes.addClass(classes) }}>
+  {%- for item in items -%}
+    {{ item.content }}
+  {%- endfor -%}
+</span>
+{% endif %}