lark: Added properties to concept model

Fixes: #26 (closed)

Local Checklist

• Read our Contributing guide (for newcomers)
• Tests written and passing locally?
• Code style checked?
• QA-ed locally?
• Rebased with master branch?
• Configuration updated (if needed)?
• Documentation updated (if needed)?

What does this Merge Request do?

Adding attributes to the concept model basing on the model in ticket #23 (closed).

Why are we doing this? Any context of related work or Epic?

References #23 (closed)

Where should a reviewer start?

Manual testing steps?

Database changes

New ENV variables

Screenshots