Add custom data to init method

Hi! I have a shiny server-client application, which is receive/send data from/to server using web sockets. Now I want to emulate connection to an application from another client. To do this I create a page with javascript

<script src="/sock/jquery.min.js"></script>
<script src="/sock/shiny.min.js"></script>
<script src="/sock/sockjs-0.3.4.min.js"></script>
<script src="/sock/shiny-server-client.min.js"></script>
<script>preShinyInit({ reconnect: true, disableProtocols: [] });</script>

At the first time another client sends data via web socket

["1#0|m|{\"method\":\"init\",\"data\":{\".clientdata_pixelratio\":1,\".clientdata_url_protocol\":\"http:\",\".clientdata_url_hostname\":\"salesbox\",\".clientdata_url_port\":\"\",\".clientdata_url_pathname\":\"/sock/\",\".clientdata_url_search\":\"\",\".clientdata_url_hash_initial\":\"\",\".clientdata_url_hash\":\"\",\".clientdata_singletons\":\"\"}}"]

But shiny application send

["1#0|m|{\"method\":\"init\",\"data\":{\"optsTabset\":\"Strategy\",\"generate:shiny.action\":0,\"note\":\" \",\"strategy\":\"CapPro\",\"paths\":\"1000\",\"ul\":[],\"start_date:shiny.date\":\"2021-02-16\",\"adjust_mean\":false,\"rhp:shiny.number\":5,\"fix_cpn:shiny.number\":0,\"hist_depth:shiny.number\":5,\".clientdata_output_scenarios_plot_width\":500,\".clientdata_output_scenarios_plot_height\":400,\".clientdata_output_scenarios_plot_bg\":\"rgb(255, 255, 255)\",\".clientdata_output_scenarios_plot_fg\":\"rgb(51, 51, 51)\",\".clientdata_output_scenarios_plot_accent\":\"rgb(51, 122, 183)\",\".clientdata_output_scenarios_plot_font\":{\"families\":[\"Helvetica Neue\",\"Helvetica\",\"Arial\",\"sans-serif\"],\"size\":\"14px\"},\".clientdata_output_strat_params_hidden\":false,\".clientdata_output_downloadData_hidden\":false,\".clientdata_output_scenarios_plot_hidden\":false,\".clientdata_output_scenarios_table_hidden\":false,\".clientdata_output_distrib_table_hidden\":false,\".clientdata_output_generated_hidden\":false,\".clientdata_pixelratio\":1,\".clientdata_url_protocol\":\"http:\",\".clientdata_url_hostname\":\"10.56.154.141\",\".clientdata_url_port\":\"\",\".clientdata_url_pathname\":\"/scenarios/\",\".clientdata_url_search\":\"\",\".clientdata_url_hash_initial\":\"\",\".clientdata_url_hash\":\"\",\".clientdata_singletons\":\"\"}}"] 

As you see some init data are apply to init method.

How to add some init data to init method?

Thank you in advance!