[Python] Typed python Capitalize Literals

I am trying to do the python equivalent of the following typescript type.

type EventsTypes = 'click' | 'touch';
type EventHandlers = `on${Capitalize<EventsTypes>}`; // 'onClick' | 'onTouch'


I read through https://docs.python.org/3/library/typing.html and there doesn't seem to be a built-in way so I tried the following

import typing
@typing._SpecialForm
def Capitalize(self,*parameters):
args = [p.title() for p in typing._flatten_literal_params(parameters)]
return typing.Literal[*args]

@typing._SpecialForm
def Concat(self,parameters):
prepend = parameters[0]
types = parameters[1:]
args = [prepend+p for p in typing._flatten_literal_params(types)]
return typing.Literal[*args]

EventTypes = typing.Literal['click','touch']
EventsCapitalized = Capitalize[EventTypes]
print(EventsCapitalized) #typing.Literal["Click","Touch"] however, vscode on hover over EventsCapitalized says the type is object
EventHandlers = Concat["on",Capitalize[EventTypes]]
print(eventHandlers) #typing.Literal["onClick","onTouch"] however, vscode on hover over EventHandlers says the type is object


I was hoping that someone has solved this before.

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