as salaamu 'alaikum.
Would you please add in the paragraph themes for us to choose from with a range of ayaat within a surah (and juz > hizb / ruba')?
The markings of 'juz/hizb/ruba' were divisions that were not created with the meanings in mind and should not be used as points when starting/stopping one's silent/oral recitation - rather they were added based on the count of the number of words in the Qur'an.
Please see the following paper for more details:
A few options for paragraph themes:
  1. The Clear Qur'an by Sheikh/Dr. Mustafa Khattab
  2. https://download.understandquran.com/fileadmin/user_upload/courses/full/english/complete_surah_%20contents.pdf
  1. https://www.majesticquran.co.uk/
Jazaakumu Allahu khaira.