Support cards / complex data elements inside element templates

[nikku]

Is your feature request related to a problem? Please describe

Often times I'm dealing with complex data in my element template. Considering a template for a Slack connector for example: While some of the data (i.e. a users name and avatar) is important for me to understand the property I configured other data is required for execution (the user or channel ID).

Right now I can only input plain data, which is for example a users technical name (or id). It may not mean a lot to me (often times missing contextual help / avatar / human readable label):

Describe the solution you'd like

Rather than configuring plain text (the user ID) I'd love to pick (#1) and see the complex data element that I've configured:

That data shall be persisted during diagram safe (i.e. I want to see it again next time I configure the task.

The basic requirements for the complex data element are:

• Visual label
• Technical meta-data value ?
• Optional icon

Potential candidates:

• Optional long form description
• Optional url to link to

Describe alternatives you've considered

Keep templates static and plain.

Additional context

Related to #1 (we shall support the same complex data there).