Non editable checkout.liquid when using cartCreate checkoutUrl

Shopify Partner
6 0 2

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:
this is the resulting checkout url: 

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!

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