Add object to json in Template

[mobile.andrew.jones (Andrew Jones)]

If you look around the forum you will find datetime jinja macros - hold on -

Easy Time Macros for Templates!

Hello community! As you may know, 2023.4 offers a new global template macro option in Home Assistant. How does this benefit you? The introduction of this feature allows me to easily share all the templates I’ve helped you create over the years in a single easy-to-use template library! All in your native language! Introducing… Easy Time Jinja A 1-stop-shop for easy time calculations. Get it from HACS! These templates are now available in HACS, with a caveat. In order to see templat…

This is what you will be wanting to convert your next_line_timediff to I assume you are wanting 13mins etc