Assuming by PC, you mean a Windows PC, it's not a simple process to get the voice memo file ot a Pcf you can then sync backk to the iPhone to get into the Music App.
You will need to first extract the voice memo from ther Voice Memo's app, if its not too large, you may be able to email it to yourself.
- On your iPhone, open the voice memo app, select the voice memo and tap on the ... dots at the top rght. click on Share and then on the Mail app to attach it to an email. Enter your email address for an account you can access on your Windows PC and send the email.
- Once you receive the email on your PC, then save the voice memo attachment to a folder on your PC.
- Open the iTunes app or the Music app, depending on what you have installed, and go to the File Menu ➜ Import option and navigate to the voie memo file you saved to import it into the Music App. Once its been import it, you can edit its data by right clicking on it and selecting Get Info from the menu. You can enter as many or as few details as you want and give it picture or album art if you want to.
- Once you have the file as you want it, you can sync it to the iPhone and it will get added ot the Music App.
- click here ➜ Sync music between your Windows device and iPhone, iPad, or iPod - Apple Support
Alternatively if you cannot email it to yourself for any reason, you can save it as a File in the Files App in a folder on iCloud Drive and access the file at https://icloud.com/drive and download it form there, and proceed to step 3 to import it into iTunes or the Music app and continue from there.