It’s something that has been discussed since Thunkable launched but it’s not something we’re actively working on.
I think the most important thing you could do in the short term is get out there and validate your idea as quickly as possible. This is what Thunkable excels at. It allows you to get your idea to the biggest audience possible for (probably) the lowest input in terms of both time and money. In a couple of months and for less than $1000 you can achieve what traditionally might have taken twice or three times as long and cost five or ten times as much.
If you get to a point where you have customers (and maybe even investors?) and Thunkable no longer suits your needs then hire a team and launch version 2 with a different stack…at least you’ll be at a point where you know you idea has value at warrants investing additional time and money in.
If your biggest concern about starting a Thunkable project is that your app might be a run away success then you should stop worrying and start using Thunkable!