Non editable checkout.liquid when using cartCreate checkoutUrl

Hi dear Shopify-Tech Community,

I have a question regarding the different checkout urls generated by the gql storefront api.
I am able to generate a checkoutUrl with this mutation:
https://shopify.dev/api/storefront/2022-01/mutations/cartCreate
this is the resulting checkout url:
https://{store-url}/checkouts/cn/{checkout-id}/information

I am generating a checkout with a product that has a selling plan attached to pay on date x.

Unfortunately I am not able to edit this checkout in my checkout.liquid in my theme. Is there a way to edit the checkout generated with cartCreate and a selling plan attached?

Thanks in advance!