Ola Hallengreen Backup Retry
Unfortunately the script itself does not have a built in path to retry a single DB for a backup if it failed. You can view the entire script options here on Ola's Site.

What I would recommend (albeit it may be a little painful) is to have a separate job step for each DB and specify the DB you want to backup. Then in each step you can add the retry options.

You could probably start by creating one or two, and then hit the script button in the SQL Agent. From there you can copy and paste the sections of SQL that create each subsequent job step and make a few alterations rather than manually modifying the job steps through the GUI.

From there I would begin evaluating whether Ola's scripts are meeting my organizations needs and I may start to look to other backup options like DBATools or Minionware or custom backup scripts. You could also alter the Ola scripts but this will be significantly more difficult. There are also paid tools that may be worth evaluating.