How sqlmodel implements the same functionality as SerializerMethodField in DRF?

[rubbish822]

First Check

• I added a very descriptive title here.
• I used the GitHub search to find a similar question and didn't find it.
• I searched the SQLModel documentation, with the integrated search.
• I already searched in Google "How to X in SQLModel" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to SQLModel but to Pydantic.
• I already checked if it is not related to SQLModel but to SQLAlchemy.

Commit to Help

• I commit to help with one of those options 👆

Example Code

from rest_framework import serializers
from drf_spectacular.utils import extend_schema_field


class UserSerializer(serializers.ModelSerializer):
    full_name = serializers.SerializerMethodField(read_only=True)
    
    @extend_schema_field(serializers.CharField)
    def full_name(self, obj):
        return f'{obj.first_name}:{obj.id}'

### Description

from rest_framework import serializers
from drf_spectacular.utils import extend_schema_field

class UserSerializer(serializers.ModelSerializer):
full_name = serializers.SerializerMethodField(read_only=True)

@extend_schema_field(serializers.CharField)
def full_name(self, obj):
    return f'{obj.first_name}:{obj.id}'

### Operating System

macOS

### Operating System Details

_No response_

### SQLModel Version

0.0.14

### Python Version

Python 3.11.1

### Additional Context

_No response_