How to set manual permissions in Wagtail ModelAdmin, by overriding the PermissionHelper

admin.py

from wagtail.contrib.modeladmin.helpers.permission import PermissionHelper
from wagtail.contrib.modeladmin.options import (
    ModelAdmin,
    modeladmin_register
)


class MyModelPermissionHelper(PermissionHelper):
    def user_can_create(self, _user):
        return False

    def user_can_inspect_obj(self, _user, _obj):
        return True

    def user_can_edit_obj(self, _user, _obj):
        return False


class MyModelAdmin(ModelAdmin):
    # Your config here
    
    permission_helper_class = DataLogEntryPermissionHelper
    
    
modeladmin_register(MyModelAdmin)