Dear Feralflora,
thank you so much for your help - I finally got a working template going now 
The only issue is that this template doesn’t import my comments to marked texts, any idea on where to find the hint how to do that? (I have NO IDEA about YAML, Markdown, etc. unfortunately - new to this game
)
Code of my template is:
cssclass: research-note
type: “{{itemType}}”{% for type, creators in creators | groupby(“creatorType”) -%}{% if loop.first %}
{% endif %}{{type | replace(“interviewee”, “author”) | replace(“director”, “author”) | replace(“presenter”, “author”) | replace(“podcaster”, “author”) | replace(“programmer”, “author”) | replace(“cartographer”, “author”) | replace(“inventor”, “author”) | replace(“sponsor”, “author”) | replace(“performer”, “author”) | replace(“artist”, “author”)}}: “{%- for creator in creators -%}{%- if creator.name %}{{creator.name}}{%- else %}{{creator.lastName}}, {{creator.firstName}}{%- endif %}{% if not loop.last %}; {% endif %}{% endfor %}”{% if not loop.last %}
{% endif %}{%- endfor %}{% if title %}
title: “{{title}}”{% endif %}{% if publicationTitle %}
publication: “{{publicationTitle}}”{% endif %}{% if date %}
date: {{date | format(“YYYY-MM-DD”)}}{% endif %}{% if archive %}
archive: “{{archive}}”{% endif %}{% if archiveLocation %}
archive-location: “{{archiveLocation}}”{% endif %}
citekey: {{citekey}}
aliases:
- {{title}}
- {{citekey}}
keywords: [{{allTags}}]
{{bibliography}}
online local {%- for attachment in attachments | filterby(“path”, “endswith”, “.pdf”) %} [pdf](file://{{attachment.path | replace(" ", “%20”)}})
{% if loop.last %}
{% endif %}{%- endfor %}
{% if tags.length > 0 -%}{% for t in tags -%}#{% if t.tag == “secondary” %}source/secondary{% if not loop.last %}{% endif %}{% elif t.tag == “primary” %}source/primary{% if not loop.last %}{% endif %}{% elif “-project” in t.tag %}project/{{t.tag | lower | replace(" “, “-”) | replace(”-project", “”)}}{% else %}subject/{{t.tag | lower | replace(" ", “-”)}}{% endif %}{% if not loop.last %}
{% endif %}{%- endfor %}{%- endif %}
Index
start-date:: {% if date %}{{date | format(“YYYY-MM-DD”)}}{% endif %}
end-date::
page-no:: {% for annotation in annotations %}{% if loop.first %}{{annotation.pageLabel}}{% endif %}{% endfor %}
Connections
comment::
Note
{% macro calloutHeader(color) -%}
{%- if color == “#ff6666” -%}
Important
{%- endif -%}
{%- if color == “#5fb236” -%}
Reference
{%- endif -%}
{%- if color == “#2ea8e5” -%}
Undefined - Blue
{%- endif -%}
{%- if color == “#a28ae5” -%}
Undefined - Purple
{%- endif -%}
{%- endmacro -%}
{% persist “annotations” %}
{% set annotations = annotations | filterby(“date”, “dateafter”, lastImportDate) -%}
{% if annotations.length > 0 %}
Imported on {{importDate | format(“YYYY-MM-DD h:mm a”)}}
{%- for annotation in annotations %}
{% if annotation.color !== “#ffd400” %}
[!quote{% if annotation.color %}|{{annotation.color}}{% endif %}] {{calloutHeader(annotation.color)}}
{%- endif -%}{% if annotation.imageRelativePath %}
![[{{annotation.imageRelativePath}}]] {% endif %}{% if annotation.annotatedText %}
{{annotation.annotatedText}} (p. {{annotation.pageLabel}}){%- endif %}{%- if annotation.comment%}
%%{{annotation.comment}}%%{%- endif %}{%- endfor %}{% endif %} {% endpersist %}
Two screens that show how the “another comment?” doesn’t transfer into zotero: