Strictly speaking no, but because the {{ssr}} is eval'd in a <script> block in HTML, using the empty/non-emptyness of include_vr_js requires escaping its contents to avoid confusing the HTML lexer.  Would rather not do that to avoid this.
(i.e.
var stereoscopic = '{{ include_vr_js }}'.length != 0;
ends up with <'s and >'s in the text of the <script>, which makes HTML teh sad)