Parsing string into enum value

In my scenario I need to fill in a field in the PVA BotDesigner and ending up in the YAML to need this construct to create the ToneType enum from an input string:
Switch(Trim(Lower(Topic.SearchConfig.tone)), "friendly", ToneType.Friendly, "confident", ToneType.Confident, "empathetic", ToneType.Empathetic, "conversational", ToneType.Conversational, "motivational", ToneType.Motivational, ToneType.Professional)

While it would be a lot more convenient to be able to do this to convert a string representation of an enum into an enum value:
ToneType.parse(Topic.SearchConfig.tone)

Also parsing it this way would not need me making changes in many places once the enum might get a new entry.

The issue names no implementation files, entry points, or tests. Start by locating how Power Fx currently resolves enum references and evaluates expressions, then define the expected behavior for converting the ToneType strings shown in the examples, including unmatched input. Done means the requested string-to-enum syntax is supported and covered by tests.