Since SEOPress 3.8.2
Export redirects from Rank Math plugin
To import your redirects created from Rank Math, go to Rank Math, Status and tools, Import / export tab, Export settings section, choose Redirections and click Export button.
Save the file to your computer.
Import redirects from Rank Math plugin to SEOPress
Now go to SEO (SEOPress), Tools, Redirections tab, Import Redirections from Rank Math plugin (TXT), upload your file and click Import.
Note that, we currently do not support certain options like regex.