Twig in functions.php

I am making some modifications to WooCommerce pages and need to use functions.php to do it.

I know I can use echo do_shortcode('[icds_twig]'); and echo do_shortcode('[/icds_twig]'); but then how can I put the other twig code between that?

Am attempting to add pages to the My Account page of WooCommerce, but I need to pull some data from Dataverse in these pages.

Alternatively, can I create the pages I need using the block editor and then somehow call those pages from functions.php?

Thank you.
Joe