How Can I get the First and last name from users in Firebase?

So how would I do this? Basically I have a list of patients in the firestore. I want to read from the list of patients and populate them into something on the website. But I'm unsure of how to do so.

        <v-autocomplete
            :items="patients"
            :filter="customFilter"
            color="blue"
            v-model="selectedPatient"
            label="Select a patient to send report to"

        ></v-autocomplete>
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    db.collection('users').where("usertype", "==", "Patient")
        .get()
        .then(querySnapshot => {
          const users = querySnapshot.docs.map(doc => doc.data())
          this.patients = users;
        })

I'm not sure how to get it working. attempted this but it doesn't really work. So I iterate through the docs and then save it to patients value when then populates the autocomplete tag. But it only shows up as object object Pic