Thanks for the response, have figured it out during the day how it works with the strong app; in case someonce else is wanting something like this it is working: the repetition stuff is anways easy and manually to press on the phone after being done, my problem was the time period stuff: but there are countdowns for having a break so you can use these countdowns for the exercise as well.
Just create the exercises which do not exist there or use something familiar just for you to remember.
Then put the auto rest timer work set to 30sec for each exercise to have the 30sec break.
For everything with a time limit create 3 sets and put the auto reset counter to either the exact time or +5sec to have time to prepare.
Sounds complicated but went through (failed with some excerised 😀 ) but the app worked, for example with power point: auto rest timer to 35sec; 1 set (1 half), 2 set (other half), 3 set (for the break); the rest is always in between the sets so if you press done with the first set the actual countdown for you to do it starts 😉
In case something is unclear and someone else wants to use it let me know, hope like this I keep doing it and improve, especially L sit was just disasterous 😀