Using Automate, it is relatively easy to automate various tasks on your phone.
In this case, every day at 12:00 and 20:00, Automate will make an API request
to tomatenmhark.org.
See the api docs, create a URL that works
for your daily trip, and specify it in the "HTTP request" block in the provided automate flow.
A valid URL would be, for example, https://tomatenmhark.org/n%C3%B6pnv/vvs/short/in_hrs/16/mins_before_check/oberdrackenstein%20rathaus/merklingen%20bahnhof?hour=8&minute=40&interchanges=0&minutes=25.
You can get Automate from Google Play.
Then download the .flo file and import it in Automate.