For the most part, doctor letters are not considered particularly valuable for MD applications compared with DO letters for DO applications.
As a scribe have you worked with/for these professionals or were you shadowing which suggests just watching someone work. As a scribe, weren't you working rather than shadowing?
Letters from physicians you've shadowed tend to be a waste of my time as an adcom. Letters from employers can be valuable although the skills of a scribe (taking dictation, doing data entry quickly and accurately, recording times that specific things were done during codes) are not what adcoms are looking for but if you have been a team player, have shown discretion, resilience, maturity, then those would be the things an adcom would like to hear from a physician on behalf of an applicant regardless of the applicant's job title in a workplace.