typed msg property

[smcgann99]

As is becoming more common with other nodes, the ability to enter a msg property in config other than payload may add some flexibilty.

[das399igste]

I feel the same way. I implemented this in a fork and it has been working for a few days.
But I find it a bit difficult to enter the adjustments in the TS files from the original. I've done it in the converted JavaScriot files.
It may be that the TS isn't missing something.