Integration Content in SAP Signavio Process Navigator
For SAP Best Practices business processes in SAP Signavio Process Navigator with "integration" in the title, the integration content is available within the process as "Set-up instructions".

For new implementations, these business processes would be activated in the system the same way other business processes are activated (with Solution Builder). After activation, follow the set-up instructions from Signavio Process Navigator to set up the rest of the integration.
For system conversions, Solution Builder cannot be used to activate any SAP Best Practices business processes in the converted systems. Instead, the SAP Fiori apps involved in the process are activated, and the process itself is manually built by the partner line of business (LoB) configuration expert using the IMG (Implementation Guide) and customizing capability (transaction code SPRO). If the business process is set up to mirror the SAP Best Practices process, you could then use the set-up instructions available in Signavio Process Navigator to complete the integration set-up.
Integration Content in the SAP Help Portal
Additional integration content can be found in the SAP Help Portal for SAP S/4HANA Cloud Private Edition → Integration.

Make sure to do a thorough search across Process Navigator and the SAP Help Portal to identify predelivered integration content provided by SAP.