Allow a list of existing Groups or entries for `entriesVisible`

[marstamm]

Is your feature request related to a problem? Please describe.

I want to create an element template that implements a generic Service Task. For this, I want to allow generic input/output values, but not show other entries.

Describe the solution you'd like

Allow entriesVisible to be a list of Group or entry IDs .

Describe alternatives you've considered

Handle mapping of variables in the task worker, like Connectors does. However, if I want to replicate outputExpression, I would need to implement FEEL in whatever language my worker uses

Additional context

Might be useful for RPA

[barmac]

I am moving this to the backlog, but if it's required for RPA (or anything else), we should consider to move it to ready.