Yeah you can if the license doesn’t expressly forbid modification, a FOSS program you can fork, pay someone to hack in a feature and build a modified version for you. If someone is familiar with it and it would be a quick edit and build you might be able to get it done for under 50CAD. If not then it will be a couple hundred dollars of work at least.
Just remember to follow the requirements of the program license. If it requires that you make the source also available than just add the modified files to a public git repo somewhere.
Can it be expressed or represented approximately in IEEE-754 form?