Add option to expand JSON columns by default

[arikfr]

trafficstars

Currently JSON columns are closed by default, which makes sense for some of the use cases but not for others. We need to add an option to expand those by default.

[ksa-real]

Without this feature we have to use Text element instead of JSON in many visualizations.

[aashishvanand]

Any update on when this feature will be available?

[max-hartman]

This would be extremely valuable! Please consider bumping up the roadmap.