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### Superset version
0.26
### Expected results
A Separator'esque widget that can render not just html or text, but can render
variables and even include branching logic. I'd imagine that being able to
insert Jinja templating with access to the pandas dataframe would suffice.
The reason for it, is that I want to create more descriptive text that might
help to explain the data being visualised. For example, the final rendered text
may look something like:
"USA's population is growing slower (by 5%) than Australia's"
And the Jinja template may look something like (It's been years since I've done
Jinja, so forgive any errors):
```
<text>
{% if df[df.country == 'USA'].growth < if df[df.country ==
'Australia'].growth %}
USA's population is growing slower by ( {{ df[df.country == 'USA'].growth
}} )
than Australia's.
{% else %}
USA's population is growing faster than Australia's.
{% endif %}
</text>
```
I have spent only 5 minutes looking at this, but I suspect we would need a viz
object that builds a dataframe based on the form data (i.e columns, metrics,
group by etc) as other Viz objects do, but also have a textarea like
`MarkupViz` to save our template.
Anyway, the implementation details would need to be worked out, but for me this
would be a great addition as well as for others potentially.
Thoughts ?
### Actual results
This feature does not exist AFAIK.
### Steps to reproduce
[ Full content available at:
https://github.com/apache/incubator-superset/issues/5747 ]
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