I encountered a similar situation while using Odoo 13. Specifically, I needed to hide the 'Create' button but retain the 'Import' button. Unfortunately, Odoo 13 does not directly support this functionality, as the 'Import' button is displayed only when the 'Create' button is visible. To work around this limitation, I implemented a solution by passing context from the view to my JS script, allowing me to dynamically determine whether the 'Create' button should be hidden.

XML:
`

            Page Name

            model.name

            tree

            current

            {                
"hide_add_button": 1

            }

        `

js
`odoo.define("module_name.button", function (require) {

  "use strict";

  var core = require("web.core");

  var ListController = require("web.ListController");

  var _t = core._t;

  ListController.include({

    renderButtons: function () {

      let context = this.model.get(this.handle, { raw: true }).getContext();

      this._super.apply(this, arguments);

      if (this.$buttons) {

        var addButton = this.$buttons.find(

          ".btn.btn-primary.o_list_button_add"

        );

        // add context hide_add_button : 1 in XML to hide the add button

        if (context.hide_add_button) {

          addButton.css("display", "none");

        }

      }

    },

  });

});

`

Hi may you know, how get context?