Count after comparing dates from distinct tables

Hello,

I need help with the following scenario.

I have a table where  sales representatives' training information exists:

And there is also a table that shows the transactions done by each sales rep:

I need to evaluate sales reps' performance after the trainings  by calculating the count of Transaction ids considering that Transaction Date should be after or equal to the Training Date.

The output should be something like:

Which I can then use to assess the training metadata like this:

Any idea how this can be achieved? I need to do this in DAX as the tables are very large and cannot do more transformations in PQ.
Thanks a lot for any help.