See the option in the DOI plugin settings, specifically the “%x” pattern.
Use the pattern entered below to generate DOI suffixes. Use %j for journal initials, %v for the volume number, %i for the issue number, %Y for the year, %a for the OJS article ID, %g for the OJS galley ID, %f for the OJS file ID, %p for the page number and %x for “Custom Identifier”.
Note, though, that a DOI is intended to be an opaque identifier, and generally shouldn’t be “informative”.
https://www.doi.org/doi_handbook/2_Numbering.html#2.2