[REQUEST] Custom dropdown list for blocks of plugin

[g2asell2019]

Is your feature request related to a problem? Please describe. I want to import data from external source (json file) to dropdown list like this for the parameters of plugin like this

When data was something like these ones I can do it manually But not this one

Describe the solution you'd like Read data from json file and load it into dropdown list ( combobox )

[g2asell2019]

Reference