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I ended up changing the button to having both the :data-bs-target and the @click as follows (which apparently works)
<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#kt_modal_1" @click="settings(item)">
and the modal I just pasted at the top of the page:
<div class="modal fade" tabindex="-1" id="kt_modal_1">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Modal title {{ currentItem.id }}</h5>
The settings function sets the currentItem:
settings(item) {
this.currentItem = item;
},
Source:stackexchange.com