Feature Request: Entry-to-Entry & Field-to-Field Data Migrations

[theAdhocracy]

Having spent a couple of weeks working on tidying up our content modelling following an upgrade to Craft 5, I think it would be great if Feed Me natively supported internal data migrations, both within and between existing content models.

What I mean is, adding the ability to do both of these common tasks:

1. Move data within all targeted entries from one named field to another named field. (Absolute bonus if this allowed for a transformation step in between.)
2. Move data from one Entry type to another Entry type*.

I'm aware that both can be effectively implemented by either exporting entries into a CSV or JSON file, then reimporting them via Feed Me or by creating an API endpoint of the targeted entries and ingesting that, but neither process is particularly simple and relies on specific matching and overwriting via IDs or other fields.

It would be nice to be able to remove those steps, and instead have a process where we could select a specific Entry type or subset of an Entry type (using the existing filtering functionality) and then select a target (which should allow for it to be the same Entry type), with options to copy data between fields, move data between fields, transform data between fields or within a field, leave fields unchanged, etc.

I realise that Migrations are another method for approaching this, but they rely on a good knowledge of PHP and are a very technical solution. A GUI-based solution would help lower the barriers for the relatively common task of updating a content model.

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• I would include Tags and Categories here as well, but I'm aware their future is likely quite short, though in the immediate future this would also be appreciated.