So this worked, because I needed numbers

Can u add https://github.com/google/blockly/wiki/Text#text-creation

The create with and append to

I do not think you understand, I want to create a new string to show.
Say I have "hello" and "world" I want to. Create a new string with "hello world" in it.

In js:
Let a= "hello" + "world"

Now a== "hello world"

Hope this is now more understandable, it should be in the text section, something like join action for text

https://en.wikipedia.org/wiki/Concatenation

"hello" + "world" => "hello world"

"0" + "1" => "01"

How do I concat strings?

I want to have a timer, and a label on screen 00 01 02 ....
I want to create the string from seconds, so that if it is less than 10 0+seconds

so in a function:
varaible tmp;
if (sec<10) variable ="0" + string of secs ====> concat string
else variable = string of secs

How in ui flow