<tree>

    <field name="name"/>

    <field name="amount" style="text-align:right;"/>

</tree>

Through the JS, you can do it like this :

/** @odoo-module **/

import { patch } from "@web/core/utils/patch";
import { ListRenderer } from '@web/views/list/list_renderer';
import { onMounted, onPatched } from "@odoo/owl";

patch(ListRenderer.prototype, "align_left_area_size", {
    setup() {
        this._super(...arguments);

        const alignAreaSizeLeft = () => {
            const headers = document.querySelectorAll('div[name="one2many_field"] th[data-name="your_field"]');
            const cells = document.querySelectorAll('div[name="one2many_field"] td[name="your_field"]');

            headers.forEach((el) => {
                el.classList.remove("text-end");
                el.style.textAlign = "left";

                const span_text_end = el.querySelector('span.text-end');
                if (span_text_end) {
                    span_text_end.classList.remove("text-end");
                    span_text_end.style.textAlign = "left";
                }

                const span_o_list_number_th = el.querySelector('span.o_list_number_th');
                if (span_o_list_number_th) {
                    span_o_list_number_th.classList.remove("o_list_number_th");
                    span_o_list_number_th.style.textAlign = "left";
                }
            });

            cells.forEach((el) => {
                el.classList.remove("o_list_number");
                el.style.textAlign = "left";
            });

            document.querySelectorAll('div[name="room_ids"] th[data-name="area_size"] div.d-flex').forEach((div) => {
                div.classList.remove("text-end");
                div.classList.remove("flex-row-reverse");
            });
        };

        onMounted(() => {
            alignAreaSizeLeft();
        });

        onPatched(() => {
            alignAreaSizeLeft();
        });
    },
});