Just to clarify, I’m assuming that you meant “Command” not “Control” i.e. you want to use the standard keyboard shortcut for paste (⌘V) but have it do something special in todoist?
I'd create a new Macro Group that is activated ONLY when todoist app is frontmost, and the Title of the front window contains "todoist"
Here is an example Macro to help get you started.
You didn't explicitly ask to paste the results (the MD Link), but I have assumed that you wanted to do that. I also make some other assumptions when text was not selected and the Clipboard did NOT contain an URL.
You will want to review the workflow logic and adjust as needed.
Below is just an example written in response to your request. You will need to use as an example and/or change to meet your workflow automation needs.
NOTE:
I used "TextEdit" instead of "Todoist" as the app since I do NOT have the Todoist app installed.
==You need to CHANGE the App in the Macro Group setup to "Todoist"==