125V AC is already in the "not fun" Region, so make sure you can't touch it by accident.
I can't tell you if it's because I don't know what it is used for. But I think in US electrics the Standart beaker is 16A, which is more than enough to turn it into smoke.
My tip: desolder and get some wago clamps or something similar. They are made for applications like this ant won't be the weak link.
You would need two of those.
Hol dir diese WAGO-Klemmen: https://www.amazon.de/dp/B00JB3U9CG
You could do that and it would just be a spur but wouldn't look great in my opinion.
The best option would be to get an electrician in to extend the cables by soldering and re-sleeving them.
You could also use a wago connector (like this Wago 221-413 Splicing Connector 3 Conductors 0.14-4 mm². Compact Design with Lever, Pack of 50 https://www.amazon.co.uk/dp/B00JB3U9CG/ref=cm_sw_r_apan_glt_fabc_TKNMY627C5PGXP2REGWX ) but they should be enclosed in a wago junction box (like this WAGOBOX Electrical Light Multipurpose Junction Box for WAGO Connectors Various Pack Sizes Pack of 3 https://www.amazon.co.uk/dp/B08BK6V9F9/ref=cm_sw_r_apan_glt_fabc_1MJ37PCMVGH0V5FGM9ZB ) but putting that on your wall wouldn't look too neat either.
If you want a stress free connection between stranded and solid wires. I cant recommend wago lever wire nuts enough.
https://www.amazon.co.uk/221-413-Splicing-Connector-Conductors-Compact/dp/B00JB3U9CG
You can get them here (Amazon Germany), depends on your location: https://www.amazon.de/Wago-Verbindungsklemme-221-413-50-Stück/dp/B00JB3U9CG/