Hello!
Sorry, this is not feasible the way you requested it.
You can do this by creating a text file and then importing its values into Market Locator, but the names of markets in the text file must be in a strict format, identical to the format Market Locator uses, then you can search markets by names.
See an example of such text file attached (for tomorrow's races).
If this sounds like too much work, then let's just say that your request is not possible, and you can either cancel it or change the description to some other trigger task.