Return Entire Object from for:each Template in Lightning Web Component (LWC)

Is it possible to return an entire object (not just a single field) from a for:each Template in LWC?

Specifically, I'm not sure why I can't access the object in the same way I can a normal object in object.key notation. See my test below where I hardcoded an object which is output to the console just fine, but is not output to the console when I assign the object pulled from 'event.target.dataset.account'

getAccountList.html

<template>
    <lightning-card title="Get Account List">
        <lightning-button label="Get Accounts" onclick={handleGetAccounts}></lightning-button>
        <template for:each={accList.data} for:item="account">
            <lightning-card title={account.Name} icon-name="standard:account" key={account.Id}>
                <lightning-button label="Select Account" onclick={handleSelectAccount} 
                data-account={account} data-account-id={account.Id} data-account-name={account.Name}></lightning-button>
            </lightning-card>
        </template>
</lightning-card>
    html: v.1.7
    js: {version}
</template>

getAccountList.js

import { LightningElement, wire } from 'lwc';
import getAccList from '@salesforce/apex/getAccountListController.getAccList';

export default class GetAccountList extends LightningElement {
    version='v.1.7';
    selAccount;
    @wire(getAccList) accList;
    handleGetAccounts(event){
        console.log('start handleGetAccounts');
        console.log('accList: ',JSON.stringify(this.accList));
        console.log('end handleGetAccounts');
    }
    handleSelectAccount(event){
        console.log('start handleSelectAccount');
        //Test getting simple object
        this.selAccount = {Id: 1, Name: 'David'};
        console.log('JSON.stringify(this.selAccount)', JSON.stringify(this.selAccount));
        console.log('this.selAccount.Id', this.selAccount.Id);
        
        //Cannot get entire object
        this.selAccount = event.target.dataset.account;
        console.log('JSON.stringify(this.selAccount)',JSON.stringify(this.selAccount));
        console.log('this.selAccount.Id',this.selAccount.Id);

        //Get Fields Using Dataset
        console.log('event.currentTarget.dataset.accountId',event.currentTarget.dataset.accountId);
        console.log('event.currentTarget.dataset.accountName',event.currentTarget.dataset.accountName);
        
        //Get Fields Using getAttribute
        console.log('event.target.getAttribute(\'data-account-id\')',event.target.getAttribute('data-account-id'));
        console.log('event.target.getAttribute(\'data-account-name\')',event.target.getAttribute('data-account-name'));

    }
}