[Feature Request]: Subsettable reporterCard

[gogonzo]

Feature description

Blocks in the ReporterCard should be indexed and subsetable. I'd like to:

1. replace existing block with other block
2. reorder existing blocks
3. remove existing block
4. add block at any index

It should be possible to utilise named index in the ReporterCard so that <ReporterCard>[["KM plot"]] is possible. Although, I'm not so sure whether [[ and [ is a good choice - please find an optimal solution to address 1-4

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